Amerse CALCIUM HARDNESS INCREASER establishes the proper water hardness to avoid corrosion of equipment and spa surfaces.

Water hardness describes the total amount of calcium in spa water. Amerse CALCIUM HARDNESS INCREASER brings water hardness into the proper range. Low hardness can result in corrosion of equipment and spa surfaces, and permanent wrinkling to a vinyl liner. The ideal hardness level is 150-400 parts per million (ppm). (16oz)