{"product_id":"spa-frog-serene-bromine-cartridge-3-pack","title":"Spa Frog Serene Bromine Cartridge - 3 Pack","description":"\u003cdiv style=\"font-family:inherit;color:#1f2d33;line-height:1.6;max-width:100%;\"\u003e\n\u003cdiv style=\"background:#eef7f8;border-left:5px solid #0e7c86;border-radius:8px;padding:18px 20px;margin:0 0 1.4em;\"\u003e\n\u003ch2 id=\"overview\" style=\"color:#0b3954;font-size:1.3em;margin:0 0 0.6em;\"\u003eThree Yellow Bromine Refills for Your FROG Serene Floater\u003c\/h2\u003e\n\u003cp style=\"margin:0 0 0.9em;\"\u003eThe Spa Frog Serene Bromine Cartridge 3 Pack gives you three of the yellow 150 g bromine cartridges used in FROG Serene Floating and In-Line systems. At FROG's typical 2 to 4 weeks per cartridge, that is roughly six to twelve weeks of bromine.\u003c\/p\u003e\n\u003cp style=\"margin:0 0 0.9em;\"\u003eKeep two on the shelf while one is working, so a fresh cartridge is ready the day the old one runs dry.\u003c\/p\u003e\n\u003cdiv style=\"display:flex;flex-wrap:wrap;gap:10px;margin-top:6px;\"\u003e\n\u003cdiv style=\"flex:1 1 120px;min-width:120px;background:#fff;border:1px solid #d5e6e8;border-radius:8px;padding:10px 12px;text-align:center;\"\u003e\n\u003cdiv style=\"font-size:0.78em;text-transform:uppercase;letter-spacing:0.04em;color:#0e7c86;font-weight:600;\"\u003ePack\u003c\/div\u003e\n\u003cdiv style=\"font-size:1.02em;font-weight:700;color:#0b3954;\"\u003e3 Cartridges\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 120px;min-width:120px;background:#fff;border:1px solid #d5e6e8;border-radius:8px;padding:10px 12px;text-align:center;\"\u003e\n\u003cdiv style=\"font-size:0.78em;text-transform:uppercase;letter-spacing:0.04em;color:#0e7c86;font-weight:600;\"\u003eColor\u003c\/div\u003e\n\u003cdiv style=\"font-size:1.02em;font-weight:700;color:#0b3954;\"\u003eYellow\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 120px;min-width:120px;background:#fff;border:1px solid #d5e6e8;border-radius:8px;padding:10px 12px;text-align:center;\"\u003e\n\u003cdiv style=\"font-size:0.78em;text-transform:uppercase;letter-spacing:0.04em;color:#0e7c86;font-weight:600;\"\u003eSize\u003c\/div\u003e\n\u003cdiv style=\"font-size:1.02em;font-weight:700;color:#0b3954;\"\u003e150 g Each\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 120px;min-width:120px;background:#fff;border:1px solid #d5e6e8;border-radius:8px;padding:10px 12px;text-align:center;\"\u003e\n\u003cdiv style=\"font-size:0.78em;text-transform:uppercase;letter-spacing:0.04em;color:#0e7c86;font-weight:600;\"\u003eCovers\u003c\/div\u003e\n\u003cdiv style=\"font-size:1.02em;font-weight:700;color:#0b3954;\"\u003e6–12 Weeks\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 120px;min-width:120px;background:#fff;border:1px solid #d5e6e8;border-radius:8px;padding:10px 12px;text-align:center;\"\u003e\n\u003cdiv style=\"font-size:0.78em;text-transform:uppercase;letter-spacing:0.04em;color:#0e7c86;font-weight:600;\"\u003eSystem\u003c\/div\u003e\n\u003cdiv style=\"font-size:1.02em;font-weight:700;color:#0b3954;\"\u003eSerene Floating\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2 id=\"on-hand\" style=\"color:#0b3954;font-size:1.35em;margin:1.6em 0 0.6em;padding-bottom:6px;border-bottom:2px solid #0e7c86;\"\u003eNever Wait on a Refill\u003c\/h2\u003e\n\u003cp style=\"margin:0 0 0.9em;\"\u003eCartridges usually run out between test days. With two spares in the cupboard, you swap in a new one right away and the bromine level never drops while you wait on an order.\u003c\/p\u003e\n\u003ch2 id=\"mineral-cycle\" style=\"color:#0b3954;font-size:1.35em;margin:1.6em 0 0.6em;padding-bottom:6px;border-bottom:2px solid #0e7c86;\"\u003eMost of a Mineral Cycle in One Box\u003c\/h2\u003e\n\u003cp style=\"margin:0 0 0.9em;\"\u003eThe blue mineral cartridge lasts 4 months. Three bromine cartridges cover a good part of that stretch, and a lightly used hot tub may get close to the next mineral change.\u003c\/p\u003e\n\u003ch2 id=\"genuine\" style=\"color:#0b3954;font-size:1.35em;margin:1.6em 0 0.6em;padding-bottom:6px;border-bottom:2px solid #0e7c86;\"\u003eThe Same Genuine 150 g Cartridge\u003c\/h2\u003e\n\u003cp style=\"margin:0 0 0.9em;\"\u003eThese are the same FROG Serene 150 g yellow cartridges sold individually, order code 01-14-3824, with the same 0 to 6 setting dial and fit in the floater.\u003c\/p\u003e\n\u003ch2 id=\"key-features\" style=\"color:#0b3954;font-size:1.35em;margin:1.6em 0 0.6em;padding-bottom:6px;border-bottom:2px solid #0e7c86;\"\u003eKey Features and Benefits\u003c\/h2\u003e\n\u003cul style=\"display:flex;flex-wrap:wrap;gap:12px;padding:0;margin:0 0 1em;\"\u003e\n\u003cli style=\"flex:1 1 230px;min-width:220px;list-style:none;background:#fff;border:1px solid #d5e6e8;border-top:3px solid #0e7c86;border-radius:8px;padding:12px 14px;margin:0;\"\u003e\n\u003cstrong style=\"color:#0b3954;display:block;margin-bottom:2px;\"\u003e3 Yellow Cartridges\u003c\/strong\u003e150 g of prefilled bromine in each.\u003c\/li\u003e\n\u003cli style=\"flex:1 1 230px;min-width:220px;list-style:none;background:#fff;border:1px solid #d5e6e8;border-top:3px solid #0e7c86;border-radius:8px;padding:12px 14px;margin:0;\"\u003e\n\u003cstrong style=\"color:#0b3954;display:block;margin-bottom:2px;\"\u003eAbout 6–12 Weeks\u003c\/strong\u003eAt 2 to 4 weeks per cartridge.\u003c\/li\u003e\n\u003cli style=\"flex:1 1 230px;min-width:220px;list-style:none;background:#fff;border:1px solid #d5e6e8;border-top:3px solid #0e7c86;border-radius:8px;padding:12px 14px;margin:0;\"\u003e\n\u003cstrong style=\"color:#0b3954;display:block;margin-bottom:2px;\"\u003eFits the Serene Floater\u003c\/strong\u003eSnaps in beside the blue mineral.\u003c\/li\u003e\n\u003cli style=\"flex:1 1 230px;min-width:220px;list-style:none;background:#fff;border:1px solid #d5e6e8;border-top:3px solid #0e7c86;border-radius:8px;padding:12px 14px;margin:0;\"\u003e\n\u003cstrong style=\"color:#0b3954;display:block;margin-bottom:2px;\"\u003eAdjustable 0–6\u003c\/strong\u003eMatched to 200 to 600 gallons.\u003c\/li\u003e\n\u003cli style=\"flex:1 1 230px;min-width:220px;list-style:none;background:#fff;border:1px solid #d5e6e8;border-top:3px solid #0e7c86;border-radius:8px;padding:12px 14px;margin:0;\"\u003e\n\u003cstrong style=\"color:#0b3954;display:block;margin-bottom:2px;\"\u003eNo Measuring\u003c\/strong\u003eSealed bromine, nothing to scoop.\u003c\/li\u003e\n\u003cli style=\"flex:1 1 230px;min-width:220px;list-style:none;background:#fff;border:1px solid #d5e6e8;border-top:3px solid #0e7c86;border-radius:8px;padding:12px 14px;margin:0;\"\u003e\n\u003cstrong style=\"color:#0b3954;display:block;margin-bottom:2px;\"\u003eSpares Ready\u003c\/strong\u003eSwap the day one runs out.\u003c\/li\u003e\n\u003cli style=\"flex:1 1 230px;min-width:220px;list-style:none;background:#fff;border:1px solid #d5e6e8;border-top:3px solid #0e7c86;border-radius:8px;padding:12px 14px;margin:0;\"\u003e\n\u003cstrong style=\"color:#0b3954;display:block;margin-bottom:2px;\"\u003eEPA Registered\u003c\/strong\u003eEPA Reg. No. 53735-16.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 id=\"product-details\" style=\"color:#0b3954;font-size:1.35em;margin:1.6em 0 0.6em;padding-bottom:6px;border-bottom:2px solid #0e7c86;\"\u003eProduct Details\u003c\/h2\u003e\n\u003cdiv style=\"overflow-x:auto;margin:0 0 1em;\"\u003e\u003ctable style=\"width:100%;border-collapse:collapse;font-size:0.95em;\"\u003e\n\u003ccaption style=\"text-align:left;font-size:0.85em;color:#5b6b70;padding-bottom:6px;\"\u003eSpa Frog Serene Bromine Cartridge - 3 Pack specifications\u003c\/caption\u003e\n\u003cthead\u003e\u003ctr style=\"background:#0b3954;color:#fff;\"\u003e\n\u003cth scope=\"col\" style=\"text-align:left;padding:10px 12px;border:1px solid #0b3954;\"\u003eProduct Detail\u003c\/th\u003e\n\u003cth scope=\"col\" style=\"text-align:left;padding:10px 12px;border:1px solid #0b3954;\"\u003eInformation\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background:#eef7f8;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;width:42%;\"\u003eBrand\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003eFROG (King Technology, Inc.)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;width:42%;\"\u003eProduct\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003eSpa Frog Serene Bromine Cartridge - 3 Pack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#eef7f8;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;width:42%;\"\u003ePack Size\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003e3 cartridges\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;width:42%;\"\u003eCartridge Size\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003e150 g (5.3 oz) net per cartridge\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#eef7f8;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;width:42%;\"\u003eTotal Contents\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003e450 g (3 × 150 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;width:42%;\"\u003eCartridge Color\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003eYellow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#eef7f8;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;width:42%;\"\u003eProduct Type\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003ePrefilled bromine sanitizer cartridge for hot tubs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;width:42%;\"\u003eActive Ingredient\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003eBCDMH (1-bromo-3-chloro-5,5-dimethylhydantoin), 98.0%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#eef7f8;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;width:42%;\"\u003eOther Ingredients\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003e2.0%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;width:42%;\"\u003eContents Form (SDS)\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003eWhite tablets or granules sealed inside the cartridge\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#eef7f8;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;width:42%;\"\u003eMade For\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003eFROG Serene Floating System and FROG Serene In-Line System\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;width:42%;\"\u003eUse With\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003eFROG Serene Mineral Cartridge (blue), set to #6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#eef7f8;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;width:42%;\"\u003eHot Tub Size\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003eAbout 200–600 gallons on the setting chart\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;width:42%;\"\u003eAdjustable Settings\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003e0 to 6, matched to hot tub gallons\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#eef7f8;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;width:42%;\"\u003eTarget Bromine Level\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003e1.0–2.0 ppm, at least 1.0 ppm at all times\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;width:42%;\"\u003eWater Balance (Floating Manual)\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003epH 7.2–7.6, total alkalinity 80–120 ppm, total hardness 150–250 ppm, TDS under 1,500, cyanuric acid 0–50 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#eef7f8;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;width:42%;\"\u003eTypical Cartridge Life\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003eAbout 2 to 4 weeks, depending on hot tub size and use\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;width:42%;\"\u003eRefillable\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#eef7f8;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;width:42%;\"\u003eRecommended Shock\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003eFROG Maintain non-chlorine shock, weekly or as needed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;width:42%;\"\u003eHolder or Floater Included\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#eef7f8;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;width:42%;\"\u003eHazard Classification (SDS)\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003eDanger: corrosive, causes severe skin burns and eye damage, harmful if swallowed or inhaled, may cause an allergic skin reaction, oxidizer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;width:42%;\"\u003eStorage\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003eOriginal packaging, tightly closed and upright, cool and ventilated, at or below 86°F (30°C), locked up\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#eef7f8;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;width:42%;\"\u003eShipping Note (SDS)\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003eShipped under Limited Quantities provisions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;width:42%;\"\u003eEPA Registration No.\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003e53735-16\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#eef7f8;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;width:42%;\"\u003eCalifornia Registration No.\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003e53735-16-AA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;width:42%;\"\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003e01-14-3824 (3 single cartridges)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#eef7f8;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;width:42%;\"\u003eStore SKU\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003e01-14-3824-3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;width:42%;\"\u003eUPC\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003e722906038214 (single cartridge)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#eef7f8;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;width:42%;\"\u003eEstimated Supply\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003eAbout 6 to 12 weeks for one hot tub\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;width:42%;\"\u003eImage Alt Text\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003eThree yellow Spa Frog Serene 150 g bromine cartridges for FROG Serene Floating and In-Line systems, 3 pack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003ch2 id=\"how-to-use\" style=\"color:#0b3954;font-size:1.35em;margin:1.6em 0 0.6em;padding-bottom:6px;border-bottom:2px solid #0e7c86;\"\u003eHow to Use the FROG Serene Bromine Cartridge\u003c\/h2\u003e\n\u003col style=\"list-style:none;padding:0;margin:0 0 1em;\"\u003e\n\u003cli style=\"display:flex;gap:12px;align-items:flex-start;margin:0 0 10px;\"\u003e\n\u003cspan aria-hidden=\"true\" style=\"flex:0 0 30px;height:30px;border-radius:50%;background:#0e7c86;color:#fff;font-weight:700;display:flex;align-items:center;justify-content:center;\"\u003e1\u003c\/span\u003e\u003cspan\u003e\u003cstrong style=\"color:#0b3954;\"\u003eBalance the water first:\u003c\/strong\u003e Test with FROG Test Strips and adjust total alkalinity to 80–120 ppm, then pH to 7.2–7.6, then hardness to 150–250 ppm. Add one balancer at a time with the jets on and wait 2 hours before retesting.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"display:flex;gap:12px;align-items:flex-start;margin:0 0 10px;\"\u003e\n\u003cspan aria-hidden=\"true\" style=\"flex:0 0 30px;height:30px;border-radius:50%;background:#0e7c86;color:#fff;font-weight:700;display:flex;align-items:center;justify-content:center;\"\u003e2\u003c\/span\u003e\u003cspan\u003e\u003cstrong style=\"color:#0b3954;\"\u003eStart up with FROG Jump Start:\u003c\/strong\u003e After a fresh fill, set a starting level of 1.0–2.0 ppm with one Jump Start packet per 600 gallons. FROG says not to use a non-chlorine shock at start-up.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"display:flex;gap:12px;align-items:flex-start;margin:0 0 10px;\"\u003e\n\u003cspan aria-hidden=\"true\" style=\"flex:0 0 30px;height:30px;border-radius:50%;background:#0e7c86;color:#fff;font-weight:700;display:flex;align-items:center;justify-content:center;\"\u003e3\u003c\/span\u003e\u003cspan\u003e\u003cstrong style=\"color:#0b3954;\"\u003eSet both cartridges:\u003c\/strong\u003e Turn the blue mineral cartridge to #6. Turn the yellow bromine cartridge to the number on the setting chart for your hot tub's gallons.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"display:flex;gap:12px;align-items:flex-start;margin:0 0 10px;\"\u003e\n\u003cspan aria-hidden=\"true\" style=\"flex:0 0 30px;height:30px;border-radius:50%;background:#0e7c86;color:#fff;font-weight:700;display:flex;align-items:center;justify-content:center;\"\u003e4\u003c\/span\u003e\u003cspan\u003e\u003cstrong style=\"color:#0b3954;\"\u003eSnap them into the floater:\u003c\/strong\u003e Push both cartridges into the openings of the green FROG Serene Floating System holder until they stay in place, then let it float in the hot tub.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"display:flex;gap:12px;align-items:flex-start;margin:0 0 10px;\"\u003e\n\u003cspan aria-hidden=\"true\" style=\"flex:0 0 30px;height:30px;border-radius:50%;background:#0e7c86;color:#fff;font-weight:700;display:flex;align-items:center;justify-content:center;\"\u003e5\u003c\/span\u003e\u003cspan\u003e\u003cstrong style=\"color:#0b3954;\"\u003eFine-tune for a week:\u003c\/strong\u003e Test daily for the first week and move the bromine cartridge up or down one number per day until the strip matches 1.0–2.0 ppm.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"display:flex;gap:12px;align-items:flex-start;margin:0 0 10px;\"\u003e\n\u003cspan aria-hidden=\"true\" style=\"flex:0 0 30px;height:30px;border-radius:50%;background:#0e7c86;color:#fff;font-weight:700;display:flex;align-items:center;justify-content:center;\"\u003e6\u003c\/span\u003e\u003cspan\u003e\u003cstrong style=\"color:#0b3954;\"\u003eSwap the yellow cartridge when empty:\u003c\/strong\u003e Replace it when it runs out, usually every 2 to 4 weeks. Drain the water out of the old one, then discard it or recycle it where available.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch3 style=\"color:#0b3954;font-size:1.08em;margin:1.2em 0 0.4em;\"\u003eFROG Serene Bromine Cartridge Setting Chart\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x:auto;margin:0 0 1em;\"\u003e\u003ctable style=\"width:100%;border-collapse:collapse;font-size:0.95em;\"\u003e\n\u003cthead\u003e\u003ctr style=\"background:#0b3954;color:#fff;\"\u003e\n\u003cth scope=\"col\" style=\"text-align:left;padding:10px 12px;border:1px solid #0b3954;\"\u003eHot Tub Size\u003c\/th\u003e\n\u003cth scope=\"col\" style=\"text-align:left;padding:10px 12px;border:1px solid #0b3954;\"\u003eBromine Cartridge Setting\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background:#eef7f8;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;\"\u003e200 gallons\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003e0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;\"\u003e250 gallons\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#eef7f8;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;\"\u003e300 gallons\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;\"\u003e350 gallons\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003e2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#eef7f8;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;\"\u003e400 gallons\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003e3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;\"\u003e450 gallons\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#eef7f8;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;\"\u003e500 gallons\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003e5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;\"\u003e550 gallons\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003e5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#eef7f8;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;\"\u003e600 gallons\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003e6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cp style=\"margin:0 0 0.9em;\"\u003eFrom the FROG Serene Floating and In-Line manuals. The blue mineral cartridge always goes on #6. For the first week, test daily and move the bromine cartridge up or down one setting per day until the strip reads 1.0 to 2.0 ppm bromine.\u003c\/p\u003e\n\u003ch2 id=\"compatibility\" style=\"color:#0b3954;font-size:1.35em;margin:1.6em 0 0.6em;padding-bottom:6px;border-bottom:2px solid #0e7c86;\"\u003eCompatibility Notes\u003c\/h2\u003e\n\u003cdiv style=\"background:#fff8e6;border:1px solid #e0b44c;border-left:5px solid #e0b44c;border-radius:8px;padding:14px 16px;margin:0 0 1em;\"\u003e\n\u003ch3 style=\"color:#8a5a00;font-size:1.05em;margin:0 0 0.4em;\"\u003eBefore You Buy\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli style=\"margin:0 0 6px;\"\u003eThis is the yellow 150 g FROG Serene Bromine Cartridge. FROG's 2026 catalog lists it for both the FROG Serene Floating System and the FROG Serene In-Line System.\u003c\/li\u003e\n\u003cli style=\"margin:0 0 6px;\"\u003eIn a built-in FROG Serene In-Line holder it goes in the bottom position, under the blue mineral. FROG also makes a larger green 200 g bromine cartridge, mainly for in-line holders. FROG Serene bromine cartridges of either size work in both the floater and in-line holders.\u003c\/li\u003e\n\u003cli style=\"margin:0 0 6px;\"\u003eIt needs a blue FROG Serene Mineral Cartridge alongside it. FROG notes the lower bromine level only applies when FROG minerals are in use.\u003c\/li\u003e\n\u003cli style=\"margin:0 0 6px;\"\u003eNot for FROG @ease systems, which use SmartChlor chlorine cartridges instead of bromine.\u003c\/li\u003e\n\u003cli style=\"margin:0 0 6px;\"\u003eSized for hot tubs from about 200 to 600 gallons on the setting chart. FROG's floating system page lists hot tubs of 150 to 600 gallons.\u003c\/li\u003e\n\u003cli style=\"margin:0 0 6px;\"\u003eThe cartridge holder or floater is not included. This listing is the replacement cartridge only.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"color:#0b3954;font-size:1.08em;margin:1.2em 0 0.4em;\"\u003eWhich FROG Serene Cartridge Do I Need?\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x:auto;margin:0 0 1em;\"\u003e\u003ctable style=\"width:100%;border-collapse:collapse;font-size:0.95em;\"\u003e\n\u003cthead\u003e\u003ctr style=\"background:#0b3954;color:#fff;\"\u003e\n\u003cth scope=\"col\" style=\"text-align:left;padding:10px 12px;border:1px solid #0b3954;\"\u003eCartridge\u003c\/th\u003e\n\u003cth scope=\"col\" style=\"text-align:left;padding:10px 12px;border:1px solid #0b3954;\"\u003eMade For\u003c\/th\u003e\n\u003cth scope=\"col\" style=\"text-align:left;padding:10px 12px;border:1px solid #0b3954;\"\u003eReplace\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background:#eef7f8;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;\"\u003eFROG Serene Mineral Cartridge (blue)\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003eSerene Floating and Serene In-Line\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003eEvery 4 months, or at each drain and refill\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;\"\u003eFROG Serene Bromine Cartridge, 150 g (yellow)  (this listing)\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003eSerene Floating and Serene In-Line\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003eWhen empty, about every 2 to 4 weeks\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#eef7f8;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;\"\u003eFROG Serene In-Line Bromine Cartridge, 200 g (green)\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003eMainly Serene In-Line (also fits Floating)\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003eWhen empty, about every 2 to 4 weeks\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;\"\u003eFROG Serene Cartridge Kit (1 blue + 3 yellow)\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003eSerene Floating or In-Line refill\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003eOne mineral cycle plus three bromine changes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#eef7f8;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;\"\u003eFROG Serene In-Line Refill (1 blue + 1 green)\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003eSerene In-Line refill\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003eOne mineral cycle plus one bromine change\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;\"\u003eFROG @ease cartridges\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003eFROG @ease systems only\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003eSeparate SmartChlor system, not interchangeable with Serene\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cp style=\"margin:0 0 0.9em;\"\u003eColors help you tell them apart: blue is always the mineral, yellow is the 150 g bromine and green is the larger 200 g bromine, made mainly for in-line holders. Either bromine size fits both Serene systems.\u003c\/p\u003e\n\u003ch3 style=\"color:#0b3954;font-size:1.08em;margin:1.2em 0 0.4em;\"\u003eHow Long Each Pack Lasts\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x:auto;margin:0 0 1em;\"\u003e\u003ctable style=\"width:100%;border-collapse:collapse;font-size:0.95em;\"\u003e\n\u003cthead\u003e\u003ctr style=\"background:#0b3954;color:#fff;\"\u003e\n\u003cth scope=\"col\" style=\"text-align:left;padding:10px 12px;border:1px solid #0b3954;\"\u003ePack\u003c\/th\u003e\n\u003cth scope=\"col\" style=\"text-align:left;padding:10px 12px;border:1px solid #0b3954;\"\u003eOne Hot Tub, One Cartridge at a Time\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background:#eef7f8;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;\"\u003e1 cartridge\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003e2–4 weeks\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;\"\u003e3 Pack  (this listing)\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003eAbout 6–12 weeks\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#eef7f8;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;\"\u003e6 Pack\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003eAbout 3–6 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:9px 12px;border:1px solid #d5e6e8;color:#0b3954;font-weight:600;\"\u003e12 Pack\u003c\/th\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #d5e6e8;\"\u003eAbout 6–11 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cp style=\"margin:0 0 0.9em;\"\u003eBased on FROG's 2 to 4 week cartridge life. Large hot tubs, frequent soaks and heavy bather loads empty cartridges sooner. Remember the blue mineral cartridge also needs replacing every 4 months.\u003c\/p\u003e\n\u003ch2 id=\"why-choose\" style=\"color:#0b3954;font-size:1.35em;margin:1.6em 0 0.6em;padding-bottom:6px;border-bottom:2px solid #0e7c86;\"\u003eWhy Choose the Spa Frog Serene Bromine 3 Pack\u003c\/h2\u003e\n\u003cp style=\"margin:0 0 0.9em;\"\u003eThree genuine yellow cartridges keep your Serene floater supplied for roughly two to three months, so a fresh refill is always on hand when the current one empties. Shop the full \u003ca href=\"\/collections\/frog-serene\" style=\"color:#0e7c86;font-weight:600;\"\u003eFROG Serene line\u003c\/a\u003e, or compare every \u003ca href=\"\/collections\/bromine\" style=\"color:#0e7c86;font-weight:600;\"\u003ehot tub bromine\u003c\/a\u003e option at HotTubPirate.com.\u003c\/p\u003e\n\u003ch3 style=\"color:#0b3954;font-size:1.08em;margin:1.2em 0 0.4em;\"\u003eIdeal For\u003c\/h3\u003e\n\u003cul style=\"padding-left:0;margin:0 0 1em;list-style:none;\"\u003e\n\u003cli style=\"margin:0 0 6px;padding-left:26px;position:relative;\"\u003e\n\u003cspan aria-hidden=\"true\" style=\"position:absolute;left:0;color:#0e7c86;font-weight:700;\"\u003e✓\u003c\/span\u003eFROG Serene Floating and In-Line owners\u003c\/li\u003e\n\u003cli style=\"margin:0 0 6px;padding-left:26px;position:relative;\"\u003e\n\u003cspan aria-hidden=\"true\" style=\"position:absolute;left:0;color:#0e7c86;font-weight:700;\"\u003e✓\u003c\/span\u003eKeeping spares between orders\u003c\/li\u003e\n\u003cli style=\"margin:0 0 6px;padding-left:26px;position:relative;\"\u003e\n\u003cspan aria-hidden=\"true\" style=\"position:absolute;left:0;color:#0e7c86;font-weight:700;\"\u003e✓\u003c\/span\u003eHot tubs from 200 to 600 gallons\u003c\/li\u003e\n\u003cli style=\"margin:0 0 6px;padding-left:26px;position:relative;\"\u003e\n\u003cspan aria-hidden=\"true\" style=\"position:absolute;left:0;color:#0e7c86;font-weight:700;\"\u003e✓\u003c\/span\u003eAbout two to three months of bromine\u003c\/li\u003e\n\u003cli style=\"margin:0 0 6px;padding-left:26px;position:relative;\"\u003e\n\u003cspan aria-hidden=\"true\" style=\"position:absolute;left:0;color:#0e7c86;font-weight:700;\"\u003e✓\u003c\/span\u003eOwners who test weekly\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 id=\"faq\" style=\"color:#0b3954;font-size:1.35em;margin:1.6em 0 0.6em;padding-bottom:6px;border-bottom:2px solid #0e7c86;\"\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv style=\"border:1px solid #d5e6e8;border-radius:8px;padding:12px 16px;margin:0 0 10px;background:#fff;\"\u003e\n\u003ch3 style=\"color:#0b3954;font-size:1.03em;margin:0 0 0.35em;\"\u003eHow long will a 3 pack of FROG Serene bromine cartridges last?\u003c\/h3\u003e\n\u003cp style=\"margin:0;\"\u003eRoughly six to twelve weeks for one hot tub, since FROG rates each cartridge at 2 to 4 weeks. Heavy use and bigger hot tubs land at the short end of that range.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border:1px solid #d5e6e8;border-radius:8px;padding:12px 16px;margin:0 0 10px;background:#fff;\"\u003e\n\u003ch3 style=\"color:#0b3954;font-size:1.03em;margin:0 0 0.35em;\"\u003eCan I use these in a Hot Spring, Caldera or Marquis in-line system?\u003c\/h3\u003e\n\u003cp style=\"margin:0;\"\u003eYes, if the holder is a FROG Serene In-Line holder. FROG's catalog lists these yellow 150 g cartridges for the In-Line System. The green 200 g size also fits and holds more bromine.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border:1px solid #d5e6e8;border-radius:8px;padding:12px 16px;margin:0 0 10px;background:#fff;\"\u003e\n\u003ch3 style=\"color:#0b3954;font-size:1.03em;margin:0 0 0.35em;\"\u003eCan I save money by refilling the cartridges?\u003c\/h3\u003e\n\u003cp style=\"margin:0;\"\u003eNo. FROG's label says not to refill them. The cartridge meters a set amount of bromine, so refilling with loose tablets can throw off the level and is not how it is registered for use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border:1px solid #d5e6e8;border-radius:8px;padding:12px 16px;margin:0 0 10px;background:#fff;\"\u003e\n\u003ch3 style=\"color:#0b3954;font-size:1.03em;margin:0 0 0.35em;\"\u003eHow do I find the right dial setting for my hot tub size?\u003c\/h3\u003e\n\u003cp style=\"margin:0;\"\u003eLook up your gallons on the FROG chart, from 0 at 200 gallons up to 6 at 600 gallons, and turn the cartridge to that number. Adjust by one setting a day until it reads 1.0 to 2.0 ppm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border:1px solid #d5e6e8;border-radius:8px;padding:12px 16px;margin:0 0 10px;background:#fff;\"\u003e\n\u003ch3 style=\"color:#0b3954;font-size:1.03em;margin:0 0 0.35em;\"\u003eWill a 3 pack get me to my next mineral change?\u003c\/h3\u003e\n\u003cp style=\"margin:0;\"\u003eSometimes. The mineral lasts 4 months, about 17 weeks. Three cartridges at 2 to 4 weeks each cover 6 to 12 weeks, so most hot tubs need one or two more before the mineral is due.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border:1px solid #d5e6e8;border-radius:8px;padding:12px 16px;margin:0 0 10px;background:#fff;\"\u003e\n\u003ch3 style=\"color:#0b3954;font-size:1.03em;margin:0 0 0.35em;\"\u003eWhat makes a cartridge run out sooner?\u003c\/h3\u003e\n\u003cp style=\"margin:0;\"\u003eFROG says cartridge life depends on hot tub size and the number of users. A higher setting, frequent soaks and many bathers all draw more bromine.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border:1px solid #d5e6e8;border-radius:8px;padding:12px 16px;margin:0 0 10px;background:#fff;\"\u003e\n\u003ch3 style=\"color:#0b3954;font-size:1.03em;margin:0 0 0.35em;\"\u003eHow do I put a new cartridge in the floater?\u003c\/h3\u003e\n\u003cp style=\"margin:0;\"\u003eSet the cartridge to your number, then push it into its opening in the green FROG Serene floater until it stays in place, with the blue mineral cartridge in the other opening.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border:1px solid #d5e6e8;border-radius:8px;padding:12px 16px;margin:0 0 10px;background:#fff;\"\u003e\n\u003ch3 style=\"color:#0b3954;font-size:1.03em;margin:0 0 0.35em;\"\u003eWhich test strips should I use?\u003c\/h3\u003e\n\u003cp style=\"margin:0;\"\u003eFROG Test Strips that read bromine, plus pH, alkalinity and hardness. FROG @ease strips are designed for SmartChlor systems, not Serene bromine.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border:1px solid #d5e6e8;border-radius:8px;padding:12px 16px;margin:0 0 10px;background:#fff;\"\u003e\n\u003ch3 style=\"color:#0b3954;font-size:1.03em;margin:0 0 0.35em;\"\u003eCan I use these in a hot tub larger than 600 gallons?\u003c\/h3\u003e\n\u003cp style=\"margin:0;\"\u003eThe setting chart tops out at 600 gallons, and FROG lists the floating system for hot tubs of 150 to 600 gallons. For a larger spa, ask the HotTubPirate.com team about other options.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border:1px solid #d5e6e8;border-radius:8px;padding:12px 16px;margin:0 0 10px;background:#fff;\"\u003e\n\u003ch3 style=\"color:#0b3954;font-size:1.03em;margin:0 0 0.35em;\"\u003eWhat is the lowest bromine level I should keep?\u003c\/h3\u003e\n\u003cp style=\"margin:0;\"\u003eAt least 1.0 ppm at all times, per FROG. The working range with FROG minerals is 1.0 to 2.0 ppm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border:1px solid #d5e6e8;border-radius:8px;padding:12px 16px;margin:0 0 10px;background:#fff;\"\u003e\n\u003ch3 style=\"color:#0b3954;font-size:1.03em;margin:0 0 0.35em;\"\u003eHow often should I test when I first set up a cartridge?\u003c\/h3\u003e\n\u003cp style=\"margin:0;\"\u003eDaily for the first week. FROG's manual says to adjust the cartridge one setting per day until the strip matches the 1.0 to 2.0 ppm bromine range, then test regularly after that.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border:1px solid #d5e6e8;border-radius:8px;padding:12px 16px;margin:0 0 10px;background:#fff;\"\u003e\n\u003ch3 style=\"color:#0b3954;font-size:1.03em;margin:0 0 0.35em;\"\u003eCan I change the setting after the cartridge is in the floater?\u003c\/h3\u003e\n\u003cp style=\"margin:0;\"\u003eYes. Lift the floater out, turn the bromine cartridge up or down one number and put it back. FROG recommends one-step changes so you can see the effect the next day.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border:1px solid #d5e6e8;border-radius:8px;padding:12px 16px;margin:0 0 10px;background:#fff;\"\u003e\n\u003ch3 style=\"color:#0b3954;font-size:1.03em;margin:0 0 0.35em;\"\u003eWill these work in a FROG @ease floating system?\u003c\/h3\u003e\n\u003cp style=\"margin:0;\"\u003eNo. FROG @ease runs on SmartChlor chlorine cartridges and its own mineral cartridge. Serene bromine cartridges are for FROG Serene systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border:1px solid #d5e6e8;border-radius:8px;padding:12px 16px;margin:0 0 10px;background:#fff;\"\u003e\n\u003ch3 style=\"color:#0b3954;font-size:1.03em;margin:0 0 0.35em;\"\u003eWhat should I check if the water turns cloudy?\u003c\/h3\u003e\n\u003cp style=\"margin:0;\"\u003eFROG's troubleshooting list: confirm pH, alkalinity and hardness, see whether the bromine cartridge is empty, make sure the mineral is under 4 months old and shock with FROG Maintain.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border:1px solid #d5e6e8;border-radius:8px;padding:12px 16px;margin:0 0 10px;background:#fff;\"\u003e\n\u003ch3 style=\"color:#0b3954;font-size:1.03em;margin:0 0 0.35em;\"\u003eAre these the same cartridges as the single?\u003c\/h3\u003e\n\u003cp style=\"margin:0;\"\u003eYes. Each one is the standard yellow 150 g FROG Serene Bromine Cartridge, order code 01-14-3824. The 3 pack simply bundles three of them.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch2 id=\"safety\" style=\"color:#0b3954;font-size:1.35em;margin:1.6em 0 0.6em;padding-bottom:6px;border-bottom:2px solid #0e7c86;\"\u003eSafety Notes\u003c\/h2\u003e\n\u003cdiv style=\"background:#fdf1f0;border:1px solid #e4a29b;border-left:5px solid #e4a29b;border-radius:8px;padding:14px 16px;margin:0 0 1em;\"\u003e\n\u003ch3 style=\"color:#b42318;font-size:1.05em;margin:0 0 0.4em;\"\u003eHandle With Care\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli style=\"margin:0 0 6px;\"\u003eDanger: corrosive. The bromine inside causes severe skin burns and eye damage and is harmful if swallowed or inhaled. Wear gloves and eye protection when you handle or drain a cartridge.\u003c\/li\u003e\n\u003cli style=\"margin:0 0 6px;\"\u003eDo not open, break or refill the cartridge, and do not handle a damaged cartridge without protective gear.\u003c\/li\u003e\n\u003cli style=\"margin:0 0 6px;\"\u003eStrong oxidizer. Keep it away from heat, flames and combustible materials, and never mix it with other chemicals.\u003c\/li\u003e\n\u003cli style=\"margin:0 0 6px;\"\u003eDo not use it in a feeder or other device that has been used with calcium hypochlorite.\u003c\/li\u003e\n\u003cli style=\"margin:0 0 6px;\"\u003eIf it gets in the eyes, rinse cautiously with water for several minutes, remove contact lenses if easy to do, keep rinsing and call a poison center or doctor right away.\u003c\/li\u003e\n\u003cli style=\"margin:0 0 6px;\"\u003eStore cartridges in the original packaging, tightly closed and upright, in a cool, well-ventilated place at or below 86°F (30°C), locked up and away from children and pets.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003cdiv class=\"htp-product-documents\" style=\"font-family:inherit;color:#1f2d33;line-height:1.6;\"\u003e\n\u003ch2 id=\"product-documents\" style=\"color:#0b3954;font-size:1.35em;margin:1.6em 0 0.6em;padding-bottom:6px;border-bottom:2px solid #0e7c86;\"\u003eProduct Documents\u003c\/h2\u003e\n\u003cp style=\"margin:0 0 0.9em;\"\u003eDownload the FROG Serene Floating System and In-Line System manuals for the setting chart and replacement steps, plus the official Safety Data Sheet for the bromine cartridge.\u003c\/p\u003e\n\u003cdiv style=\"display:flex;flex-wrap:wrap;gap:12px;margin:0 0 1.2em;\"\u003e\n\u003cdiv style=\"flex:1 1 260px;min-width:230px;background:#fff;border:1px solid #d5e6e8;border-top:3px solid #0e7c86;border-radius:8px;padding:14px 16px;display:flex;gap:12px;align-items:flex-start;\"\u003e\n\u003cdiv style=\"flex:0 0 auto;background:#0b3954;color:#fff;font-weight:700;font-size:0.75em;letter-spacing:0.05em;border-radius:6px;padding:10px 8px;line-height:1;\"\u003ePDF\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 auto;\"\u003e\n\u003cdiv style=\"font-weight:700;color:#0b3954;margin:0 0 4px;\"\u003eFROG Serene Floating System Manual\u003c\/div\u003e\n\u003cdiv style=\"font-size:0.9em;color:#5b6b70;margin:0 0 10px;\"\u003eSet-up, setting chart, cartridge replacement and troubleshooting (PDF, 2 pages)\u003c\/div\u003e\n\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0269\/2625\/2077\/files\/frog-serene-floating-system-manual.pdf\" target=\"_blank\" rel=\"noopener\" style=\"display:inline-block;background:#0e7c86;color:#fff;text-decoration:none;font-weight:600;font-size:0.92em;padding:8px 14px;border-radius:6px;\"\u003eView or Download Instructions\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 260px;min-width:230px;background:#fff;border:1px solid #d5e6e8;border-top:3px solid #0e7c86;border-radius:8px;padding:14px 16px;display:flex;gap:12px;align-items:flex-start;\"\u003e\n\u003cdiv style=\"flex:0 0 auto;background:#0b3954;color:#fff;font-weight:700;font-size:0.75em;letter-spacing:0.05em;border-radius:6px;padding:10px 8px;line-height:1;\"\u003ePDF\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 auto;\"\u003e\n\u003cdiv style=\"font-weight:700;color:#0b3954;margin:0 0 4px;\"\u003eFROG Serene In-Line System Manual\u003c\/div\u003e\n\u003cdiv style=\"font-size:0.9em;color:#5b6b70;margin:0 0 10px;\"\u003eHolder removal, cartridge placement, setting chart and routine care (PDF, 2 pages)\u003c\/div\u003e\n\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0269\/2625\/2077\/files\/frog-serene-in-line-system-manual.pdf\" target=\"_blank\" rel=\"noopener\" style=\"display:inline-block;background:#0e7c86;color:#fff;text-decoration:none;font-weight:600;font-size:0.92em;padding:8px 14px;border-radius:6px;\"\u003eView or Download Instructions\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 260px;min-width:230px;background:#fff;border:1px solid #d5e6e8;border-top:3px solid #0e7c86;border-radius:8px;padding:14px 16px;display:flex;gap:12px;align-items:flex-start;\"\u003e\n\u003cdiv style=\"flex:0 0 auto;background:#0b3954;color:#fff;font-weight:700;font-size:0.75em;letter-spacing:0.05em;border-radius:6px;padding:10px 8px;line-height:1;\"\u003ePDF\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 auto;\"\u003e\n\u003cdiv style=\"font-weight:700;color:#0b3954;margin:0 0 4px;\"\u003eSafety Data Sheet: Bromine Cartridge\u003c\/div\u003e\n\u003cdiv style=\"font-size:0.9em;color:#5b6b70;margin:0 0 10px;\"\u003eFROG Serene Bromine Cartridge Safety Data Sheet (PDF, Rev. 03, October 2022)\u003c\/div\u003e\n\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0269\/2625\/2077\/files\/frog-serene-bromine-cartridge-sds.pdf\" target=\"_blank\" rel=\"noopener\" style=\"display:inline-block;background:#0e7c86;color:#fff;text-decoration:none;font-weight:600;font-size:0.92em;padding:8px 14px;border-radius:6px;\"\u003eView or Download SDS\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"FROG","offers":[{"title":"Default Title","offer_id":68070851772603,"sku":"01-14-3824-3","price":47.85,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0269\/2625\/2077\/files\/frog-serene-bromine-cartridge-3-pack.jpg?v=1793559793","url":"https:\/\/hottubpirate.com\/products\/spa-frog-serene-bromine-cartridge-3-pack","provider":"Hot Tub Pirate","version":"1.0","type":"link"}