Description
Two Blue FROG Serene Mineral Cartridges, About 8 Months, Shipped Free
The FROG Serene Mineral Replacement Cartridge 2 Pack gives you two blue mineral cartridges for FROG Serene Floating or In-Line systems. With one change every 4 months, that is about 8 months of minerals for one hot tub.
Keep the second cartridge ready for your next change or drain and refill. The 2 Pack ships free to US addresses on online orders at HotTubPirate.com.
Your Next Mineral Change Is Already Here
Mineral cartridges are on a 4-month clock. With a spare in the cupboard, you swap on schedule, or at a surprise drain and refill, without waiting on an order.
Free US Shipping on Online Orders
The 2 Pack ships free within the US when you order online at HotTubPirate.com.
Two Hot Tubs, One Order
Running two FROG Serene hot tubs? Give each a fresh blue cartridge at the same time and both are covered for the next 4 months.
Key Features and Benefits
- 2 Blue Mineral Cartridges2.05 oz of FROG minerals each.
- About 8 MonthsFor one hot tub at 4 months each.
- Free US ShippingOn online orders at HotTubPirate.com.
- Floating or In-LineFits both FROG Serene systems.
- Always on #6Set once per cartridge.
- Up to 600 GallonsEach cartridge treats one hot tub.
- EPA RegisteredEPA Reg. No. 53735-11.
Product Details
| Product Detail | Information |
|---|---|
| Brand | FROG (King Technology, Inc.) |
| Product | FROG Serene Mineral Replacement Cartridge - 2 Pack |
| Pack Size | 2 cartridges |
| Net Weight | 2.05 oz (58 g) per cartridge |
| Total Contents | 4.1 oz (2 × 2.05 oz) |
| Cartridge Color | Blue |
| Product Type | Mineral sanitizer cartridge for hot tubs |
| Active Ingredient | Silver chloride, 0.5% (other ingredients 99.5%) |
| Mineral Carrier (SDS) | Calcium carbonate, over 98% |
| Works With | FROG Serene Floating System and FROG Serene In-Line System |
| Pair With | FROG Serene bromine cartridge: yellow 150 g or green 200 g (mainly in-line); either fits both systems |
| Hot Tub Size | Up to 600 gallons |
| Setting | #6, no further adjustment needed |
| Replacement Interval | Every 4 months or at each drain and refill, whichever comes first |
| Refillable or Reusable | No. Discard even if media appears to be left |
| Bromine Level With Minerals | 1.0–2.0 ppm, at least 1.0 ppm at all times |
| Water Balance | pH 7.2–7.8 on the label and In-Line manual (7.2–7.6 in the Floating manual), total alkalinity 80–120 ppm, hardness 150–250 ppm |
| Filtration | Run the pump and filter at least 3 hours a day |
| Holder or Floater Included | No |
| Hazard Information | Caution signal word on the label. SDS: very toxic to aquatic life with long-lasting effects |
| Storage | Original packaging, tightly closed, in a cool, well-ventilated place |
| DOT Shipping (SDS) | Not regulated |
| EPA Registration No. | 53735-11 |
| Manufacturer Part Number | 01-14-3812 (2 single cartridges) |
| Store SKU | 01-14-3812-2 |
| UPC | 722906038115 (single cartridge) |
| Estimated Supply | About 8 months for one hot tub, or 4 months for two |
| Image Alt Text | Two blue FROG Serene mineral replacement cartridges side by side for Serene Floating and In-Line systems, 2 pack |
How to Use the FROG Serene Mineral Cartridge
- Balance and start up the water: After a fresh fill, balance total alkalinity, pH and hardness, then set a 1.0–2.0 ppm starting level with FROG Jump Start, one packet per 600 gallons.
- Turn the mineral cartridge to #6: Hold the bottom and turn the top until 6 shows in the setting window. FROG says no further adjustment is needed for the life of the cartridge.
- Set the bromine cartridge: Turn your FROG Serene bromine cartridge to the number on the setting chart for your hot tub's gallons.
- Install both cartridges: Floating System: push both cartridges into the green floater until they stay in place. In-Line System: with the jets off, snap the mineral into the area marked "Minerals" (top) and the bromine into the lower area of the holder.
- Keep bromine at 1.0–2.0 ppm: Test daily the first week and adjust only the bromine cartridge. Run the filtration at least 3 hours a day and shock weekly with FROG Maintain.
- Replace every 4 months: Swap the blue cartridge every 4 months or whenever you drain and refill, whichever comes first. Discard the old one even if media appears to be left inside.
FROG Serene Bromine Cartridge Setting Chart
| Hot Tub Size | Bromine Cartridge Setting |
|---|---|
| 200 gallons | 0 |
| 250 gallons | 1 |
| 300 gallons | 1 |
| 350 gallons | 2 |
| 400 gallons | 3 |
| 450 gallons | 4 |
| 500 gallons | 5 |
| 550 gallons | 5 |
| 600 gallons | 6 |
From 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.
Compatibility Notes
Before You Buy
- Fits both FROG Serene systems: the Serene Floating System and the Serene In-Line System found in select Marquis, Caldera and Hot Spring hot tubs (dealers also list Artesian).
- It must be paired with a FROG Serene bromine cartridge. The minerals do not replace the bromine; they let the system run at a lower bromine level.
- Treats hot tubs up to 600 gallons. Always set it to #6, whatever the size of your hot tub.
- Not for FROG @ease systems, which use their own mineral cartridge with SmartChlor.
- The cartridge holder or floater is not included. This listing is the replacement mineral cartridge only.
Which FROG Serene Cartridge Do I Need?
| Cartridge | Made For | Replace |
|---|---|---|
| FROG Serene Mineral Cartridge (blue) (this listing) | Serene Floating and Serene In-Line | Every 4 months, or at each drain and refill |
| FROG Serene Bromine Cartridge, 150 g (yellow) | Serene Floating and Serene In-Line | When empty, about every 2 to 4 weeks |
| FROG Serene In-Line Bromine Cartridge, 200 g (green) | Mainly Serene In-Line (also fits Floating) | When empty, about every 2 to 4 weeks |
| FROG Serene Cartridge Kit (1 blue + 3 yellow) | Serene Floating or In-Line refill | One mineral cycle plus three bromine changes |
| FROG Serene In-Line Refill (1 blue + 1 green) | Serene In-Line refill | One mineral cycle plus one bromine change |
| FROG @ease cartridges | FROG @ease systems only | Separate SmartChlor system, not interchangeable with Serene |
Colors 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.
How Long Each Pack Lasts
| Pack | One Hot Tub | Two Hot Tubs |
|---|---|---|
| 1 cartridge | 4 months | One mineral change |
| 2 Pack (this listing) | About 8 months | 4 months each for two hot tubs |
Assumes a change every 4 months. If you drain and refill sooner, FROG says to replace the mineral cartridge at that time, which shortens the supply.
Why Choose the FROG Serene Mineral 2 Pack
Two genuine blue cartridges cover about 8 months for one Serene hot tub, or a full change for two, and they ship free on online orders. Shop the full FROG Serene line, or browse all hot tub mineral cartridges at HotTubPirate.com.
Ideal For
- Two mineral changes in one order
- Two-hot-tub households
- FROG Serene Floating and In-Line owners
- Unplanned drain and refills
- Shoppers who want free shipping
Frequently Asked Questions
How long does a 2 pack of FROG Serene mineral cartridges last?
About 8 months for one hot tub, since each blue cartridge is replaced every 4 months. Draining and refilling more often shortens that, because FROG ties a new cartridge to each refill.
If I have minerals, can I skip the bromine cartridge?
No. FROG Serene needs both. The blue cartridge supports a lower bromine level, but the bromine cartridge is still the main sanitizer.
Do I adjust the mineral cartridge for my hot tub size?
No. Every Serene mineral cartridge goes on #6 regardless of hot tub size. The bromine cartridge is the one you match to the setting chart.
Can I keep using an old mineral cartridge if it looks full?
No. FROG's manual says to throw it away at 4 months even if media seems to remain, and not to try reusing it, because the minerals are spent.
Can I use the 2 pack for two hot tubs?
Yes. Each cartridge treats one hot tub up to 600 gallons, so two hot tubs can each get a fresh cartridge at the same time.
How should I store the spare cartridge?
Leave it sealed in its original packaging, tightly closed, somewhere cool and well ventilated, as the Safety Data Sheet recommends, until the day you install it.
Do I replace the mineral when I change the bromine cartridge?
No. They run on separate schedules. The bromine cartridge is swapped when empty, about every 2 to 4 weeks, and the mineral every 4 months.
How many bromine cartridges will I use per mineral cartridge?
FROG's own refill kits pair one mineral with three or four bromine cartridges. At 2 to 4 weeks each, a heavily used hot tub may need a few more in 4 months.
Do FROG minerals make the water feel softer?
FROG describes Serene water as softer because it needs up to 50% less bromine. Less sanitizer usually means less of the dry, chemical feel on skin.
How do the minerals help sanitize?
FROG's In-Line manual says the system kills bacteria two ways: the mineral cartridge helps control bacteria while the bromine cartridge oxidizes contaminants such as body oils.
Is the mineral cartridge hazardous?
It carries a Caution signal word on the label and is not regulated for DOT shipping. The Safety Data Sheet notes it is very toxic to aquatic life, so never empty it into drains or ponds.
Where does the mineral cartridge go in an in-line holder?
In the top portion marked "Minerals." The bromine cartridge snaps into the lower portion, with each cartridge's indent lined up with the raised area on the holder.
Is there a shipping charge on the mineral 2 pack?
No, not for US addresses on online orders. The 2 Pack is priced over $50, so delivery is free when you check out at HotTubPirate.com.
What should I do at each drain and refill?
Clean the filters, refill, balance the water, start up with FROG Jump Start, then install a fresh blue mineral cartridge on #6 and a bromine cartridge on your chart setting.
Do the minerals help keep pH stable?
FROG says Serene water is clearer because the system helps keep pH balanced. You still test regularly and adjust pH within 7.2 to 7.8 for in-line systems.
Safety Notes
Handle With Care
- The label carries a Caution signal word. Keep the cartridge out of reach of children and pets.
- The Safety Data Sheet lists the mineral formula as very toxic to aquatic life with long-lasting effects. Do not rinse or empty it into drains, ponds or storm sewers.
- Do not try to open, refill or reuse a spent cartridge. Discard it in the trash or recycle it where available.
- Store spare cartridges in the original packaging, tightly closed, in a cool, well-ventilated place.
- Wash your hands after handling, and follow the directions on the label and in your FROG Serene manual.
Product Documents
Download the FROG Serene Floating and In-Line manuals for set-up and replacement steps, plus the official Safety Data Sheet for the mineral cartridge.