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Best Seller | O-ACE-sis Granule Calcium Hardness Increaser 25 lb Calcium Hardness Increaser Calcium Chloride. Low water hardness could stain or etch the pool surface and corrode equipment. 6 pounds of Calcium Hardness Increaser per 10 000 gallons of water will raise calcium hardness level by 50 ppm. ... more | FREE shipping go to store |
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