Spa Calcium Increase

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PLEASE NOTE: Pick Up in Store Only Low calcium hardness levels can be corrosive to hot tub and spas surfaces and equipment. The ideal range for calcium hardness in a hot tub or spa is between 150-250 ppm (parts per million). Use this product to raise your calcium hardness level if it drops below the suggested range. Natural Chemistry Spa Calcium Increaser is used to raise calcium hardness in spa water. Calcium hardness in spa water should be maintained between 150-250 ppm. Low calcium hardness levels could cause the spa water to be corrosive which may result in damage to the spa surface or equipment. Show more