VEVOR Whole House Salt Free Descaler Physical Scale Descaler System SAAS AlloyProduct Features Reduces Scale Build Up The whole house salt free descaler utilizes water flow to impact an internal special physical structure, generating microcurrents that activate calcium ions in the water, preventing crystallization into scale, with a scale descaling rate of 86%. Physical Scale Descaler Requires no external power or chemicals, so our descaler does not alter the water's pH, generate any wastewater, and retains the natural minerals