Natural Chemistry’s Spa Calcium Hardness Increaser is used to raise calcium hardness in spa water. Calcium hardness in spa water should be maintained between 150-250 ppm. Low calcium hardness levels could cause the spa water to be corrosive which may result in damage to the spa surface or equipment.
Compare test results to chart below to determine appropriate amount of product necessary to make adjustment.
With the spa not in use and circulation pump operating, add required amount directly into spa water. Continue circulating water a minimum 20 minutes. Do not pre-dissolve this treatment as heat is generated when it contacts water.