HTH® Pool Care Calcium Up 4 lbs.

Raise the calcium hardness of your swimming pool water to protect your pool surfaces and equipment from harm. Protects pool surfacesHelps chlorine to work efficientlyPrevents equipment damageCompatible with all swimming pools Raises calcium hardness levelsHelps prevent swimming pool water from becoming corrosive. Protects & prevents corrosionProtects pool liners, metal and plastic surfaces as well as equipment from damage. You’re all clear with HTH®For best results, use HTH® 6-Way Test Strips weekly to test, balance and maintain calcium hardness levels between 200 and 500 ppm.