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SpaPure Calcium Hardness Increaser 16oz
Safely raise the calcium hardness levels in your spa water
Stop and prevent the corrosion of your spa's surfaces
Compatible with all systems including bromine, chlorine, mineral sanitizers, and biguanide
For Use in All Spas and Hottubs
Helps maintain Calcium Hardness levels between 150-300 ppm. Helps prevents foaming and equipment corrosion Promotes better water balance. Compatible with all sanitizers. Made in the USA USE: Apply to the spa while the water is circulating or as it is being filled 1 ounce (2 tbs) per 500 gallons of spa water will raise calcium hardness level approximately 10 ppm.