FROG® SooTHe™ Calcium Hardness Increaser for Hot Tubs & Swim Spas – 2 lb TruDose Bottle

Test spa water to determine current calcium hardness level.

Shake the bottle of FROG® SooTHe™ before use.

With the pump running, add the recommended amount directly to the spa water using the TruDose™ cap for accurate measurement.

Allow water to circulate 30 minutes and retest.

Repeat dosing as needed until hardness reaches the recommended 150–250 ppm range.

Maintain sanitizer and pH levels as normal while adjusting calcium.

Q: What does FROG® SooTHe™ do?

A: It raises calcium hardness levels to prevent corrosive water, equipment damage, and foaming.

Q: How do I know if I need it?

A: If calcium hardness tests low (below 150 ppm), you should add SooTHe™ to bring it back into range.

Q: Is it safe for any spa brand?

A: Yes, it is compatible with all hot tub models and finishes.

Q: Will it affect pH or chlorine?

A: No, SooTHe™ is formulated not to disrupt water balance when used as directed.

Q: How often should I add it?

A: Usually only during initial fill or whenever new water lowers calcium levels.