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Calcium Plus will instantly raise calcium hardness in your pool water.

In areas where soft water is a problem, when water hardness levels drop below 150 ppm, you need to add Calcium Plus.  Will instantly raise calcium hardness in your pool water.  Low calcium hardness may cause pool water to become corrosive, which can result in etched plaster, corrosion of equipment and fixtures, or may cause metallic stains.  Dosage: 6.25 lbs. per 10,000 gallons will raise the hardness level approximately 50 ppm.