HTS Turbo Calcium Plus will increase water harness, minimize foaming, and protect metal surfaces against corrosion. It is compatible with all Hot Tub Serum products as well as all spa sanitizers including chlorine, bromine, biguanide and ozone. One level capful (2 level tablespoons) will increase hardness approx. 10 ppm in a 500-gallon spa.
Available Sizes: 14 oz.