Details: GLB 15 lb Calcium Hardness Up GLBCalcium Hardness Up increase water hardness to prevent equipment corrosion and scaling. ACTIVE INGREDIENTS:. Calcium Chloride : 94%. INERT INGREDIENTS : 6%. Total : 100% DIRECTIONS: It is a violation of Federal law to use this product in a manner inconsistent with its labeling. Normal:. 1. Determine calcium hardness level. It should be between 150-250 ppm. 2. If the level is below 150 ppm, add Calcium Hardness Up by distributing the product over the water surface. 1 lb. of Calcium Hardness Up will increase the calcium hardness 10 ppm in 10,000 gallons of water.
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