Rx Clear Calcium Hardness Increaser for Swimming Pools, 25 lbs

Made from 100% Calcium Chloride Increases water hardness and suppresses foaming 6 lbs per 10,000 gallons will raise the hardness level approximately 50 ppm ( ideal range is 200 to 400 ppm) Compatible with chlorine, bromine, ozone and biguanide sanitizers Helps prevent corrosion of metal and plaster surfaces Reduces both weathering and bubbling of specific chemicals Do not pre-dissolve this product Do not add this product on the same day that either pH Plus or Alkalinity Increaser has been added to the pool water