This product contains supplemental copper

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PacifiClear 25 Lb. Calcium Hardness Increaser Granule Canning Accessories This product contains supplemental copperCalcium hardness increaser made of calcium chloride. Low water hardness could stain or etch the pool surface and corrode equipment, calcium hardness increaser raises water hardness level. Prevents foaming and equipment corrosion. 6 Lb. of calcium hardness increaser per 10,000 gallons of water will raise calcium hardness level by 50 ppm (parts per million).