Description
FROG SooTHe Calcium Total Hardness Increaser for Hot Tubs and Swim Spas - 2 lb Bottle
Raise Calcium Hardness for Better Balanced Spa Water
FROG SooTHe Calcium Total Hardness Increaser is designed to raise low total hardness in hot tubs and swim spas, helping protect surfaces, equipment, and overall water balance. Total hardness, also called calcium hardness, refers to the level of calcium and other minerals in the water. When hardness is too low, water can become corrosive, uncomfortable, and harder to keep properly balanced.
This 2 lb bottle includes the FROG TruDose Measuring Cap, making it easier to measure and dose the right amount without searching for a separate scoop or measuring cup. Simply pour into the cap, measure with the built-in markings, and dose according to the chart on the bottle. It is a convenient solution for hot tub water care, swim spa maintenance, and routine calcium hardness adjustment.
Use FROG SooTHe when test results show total hardness below the recommended range. For best results, test water regularly, balance total alkalinity first, adjust pH, then bring total hardness into range before maintaining sanitizer.
Key Benefits
-
Raises low calcium hardness: Helps bring hot tub and swim spa water into the ideal total hardness range of 150 to 250 ppm.
-
Helps protect surfaces and equipment: Proper hardness helps reduce conditions that may contribute to corrosion, pitting, or etching.
-
Supports easier water balancing: Balanced total hardness helps make pH, alkalinity, and sanitizer levels easier to manage.
-
Improves soaking comfort: Properly balanced water can feel more comfortable on skin.
-
Helps prevent water problems: Correct hardness levels help reduce the risk of corrosive water or scale-related issues.
-
Includes FROG TruDose Measuring Cap: Built-in measuring marks help simplify dosing and reduce guesswork.
-
Made for hot tubs and swim spas: Ideal for fill/start-up balancing, weekly water checks, and ongoing maintenance.
Product Details
Compatibility and Requirements
FROG SooTHe is made for hot tubs and swim spas where total hardness needs to be increased. It can be used as part of a FROG water care routine with FROG sanitizing systems, FROG @ease test strips, and other preferred sanitizer programs when used as directed.
Total hardness should be tested when the hot tub or swim spa is first filled and checked regularly as part of ongoing water care. FROG recommends keeping total alkalinity at 80 to 120 ppm, pH at 7.2 to 7.6, and total hardness at 150 to 250 ppm. Once water balance is in range, sanitizer can be added or maintained according to your system instructions.
For application, add FROG SooTHe with the jets running while the hot tub or swim spa is not occupied. Keep the cover off during circulation, allow the water to mix thoroughly, then retest before adding more.
How to Use FROG SooTHe
-
Test your hot tub or swim spa water weekly.
-
Check total hardness, especially after filling or topping off the water.
-
If total hardness is low, use the dosing chart on the FROG SooTHe bottle.
-
Pour FROG SooTHe into the TruDose Cap and measure the recommended amount.
-
Add to the water with the jets running while the spa is not occupied.
-
Circulate jets for 30 minutes with the cover off.
-
Retest after 2 hours.
-
Repeat as needed until total hardness reaches 150 to 250 ppm.
Frequently Asked Questions
What does FROG SooTHe do?
FROG SooTHe raises total hardness, also known as calcium hardness, in hot tub and swim spa water. It is used when test results show hardness is below the recommended range.
What is the ideal total hardness range?
The recommended total hardness range for hot tubs and swim spas is 150 to 250 ppm. This range helps support proper water balance and equipment protection.
Why is low calcium hardness a problem?
Low total hardness can make water corrosive. That may contribute to pitting, etching, surface damage, and uncomfortable water.
Can high total hardness also be a problem?
Yes. If total hardness rises above the recommended range, water may contribute to scaling. FROG SooTHe is specifically used to raise low hardness, not lower high hardness.
Does this product include a measuring cap?
Yes. FROG SooTHe includes the FROG TruDose Measuring Cap with built-in markings for easier, more accurate dosing.
Can I use FROG SooTHe with FROG @ease?
Yes. FROG SooTHe can be used as part of a water balancing routine with FROG @ease or other FROG sanitizing systems. Always test first and follow the product label.