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  1. Spa Pure Hardness Increaser 16 oz
    Our Price:
    List Price: $9.99


    • 16 Ounces
    • Calcium Hardness Increaser / Booster
    • Dry Formula
    • 100% Calcium Chloride Granules
    • Use Stain and Scale Preventer weekly to prevent scale buildup
    • Low calcium hardness can corrode the heater and damage the spa surface
    • Low calcium can also contribute to excessive foaming
    • If you are adding soft water to your hot tub replace the calcium as soon as possible
    • 1 oz of this product will increase the calcium the hardness by 10 ppm per 500 gallons of water