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"SeaKlear Spa Calcium Increaser is ideal for boosting calcium hardness levels in your spa or hot tub, preventing corrosion damage to equipment and etching in plaster surfaces. Its easy-to-use liquid formula can be added directly to spa water without dilution or mixing, and is compatible with all major sanitizer systems. Best of all, Spa Calcium Increaser is made to the exacting standards SeaKlear demands of all its products, allowing you to buy with confidence.\r\n\r\n\r\n \tBoosts calcium levels in soft water\r\n \tPrevents damage to spa equipment from aggressive water\r\n \tProven effective &amp; reliable\r\n \tMade in the United States\r\n\r\n\r\n\r\nProduct Dosage\r\n\r\n1 oz. of SeaKlear Spa Calcium Increaser per 500 gal. of water increases hardness by 7 ppm\r\n\r\nAvailable Sizes\r\n\r\nSpa Calcium Increaser, 1 quart"
<https://spasbythebay.com/product/other-products/water-care/seaklear/calcium-increaser/>