Spa Pure Calcium Hardness Increaser

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The SpaPure Hardness Increaser is a granular product that is designed to safely raise the calcium hardness levels in your spa water. Regular use of this product will stop and preve nt the corrosion of your spa's surfaces. This product is compatible with all systems including bromine, chlorine, mineral sanitizers, and biguanide. Safely raise the calcium hardness levels in your spa water Stop and prevent the corrosion of your spa's surfaces Compatible with all systems including bromine, chlorine, mineral sanitizers, and biguanide Show more