Rx Clear® Swimming Pool Calcium Booster (Various Quantities)

The Rx Clear® Swimming Pool Calcium Booster raises total calcium hardness in the water to prevent staining, corrosion or etching of pools. Ideally, levels will range from 200-400ppm. Add the calcium hardness increaser when the total water hardness levels drop below 150ppm. Rx Clear® Swimming Pool Calcium Booster is composed of 100% Calcium Chloride.