HTH™ Calcium Up is a pool hardness increaser that raises calcium hardness back into the recommended 200-400 ppm range. It prevents corrosive water from damaging your pool.

• Prevents soft water from etching plaster and damaging surfaces
• Target range: 200-400 ppm
• Fast-dissolving granules broadcast easily with pump running
• Never add more than 10 lbs per 10,000 gallons at one time

You're in the Clear with HTH™.