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Natural Chemistry Spa Alkalinity Increaser - 2.71 Pounds hayward-auto-skim-skimmers use a Jack's Magic StainNatural Chemistry Spa Alkalinity Increaser Natural Chemistry's Spa Alkalinity Increaser is used to raise total alkalinity in spa water. Total alkalinity in spa water should be maintained between 80 120 ppm. Results of the buffering effect of total alkalinity are pH bather comfort, water balance, and clarity are more easily maintained. Features: Raises total alkalinity in spa hottub water. Improves bather comfort Granular formula Size: 2. 71 Pounds