Every body of water needs calcium in it. Too little calcium, water is corrosive and will damage the spa. Too much and water will produce damaging and ugly scale. When levels are ideal you will prolong the life of your spa and provide the best bather comfort. If you have a softener, you need this product! FEATURES Soluble concentrated flakes Compatible with all sanitizers and oxidizing systems BENEFITS Prevents corrosion Helps prevents foaming Eliminates etching of delicate surfaces 16 oz bottle
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