Spa Pure Calcium Hardness Increaser, 16 oz.

Every body of water needs calcium in it. Too little calcium, water is corrosive and will damage the spa. Too much will produce damaging and ugly scale. When levels are ideal you will prolong the life of your spa and provides 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 Applications Apply to the spa while the water is circulating or as it is being filled 1 ounce (2 Tbsp) per 500 gallons of water will raise calcium hardness level 10 ppm