It’s a 77% flake product that is used to raises calcium hardness in water. If much calcium needs to be added, you may add 1/3 the dosage each day to avoid clouding the pool. Add 11 lbs. per 100,000 gallons to raise calcium hardness 10 ppm. For those pools using a Chemical Control system, we suggest keep the calcium hardness 4 times that of the alkalinity. The lower the alkalinity, the higher the calcium hardness may go. Check the Saturation Index scale. Call us if assistance is needed. (50lb bag)
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