Pool Season Calcium Increaser for Pool & Spa, 8 lb & 25 lb Pool Cleaning & Maintenance Parts watertight fit between skimmer body

watertight fit between skimmer body sections and mounting surfaces

and TriStar VS 815/820 variable-speed pumps

If your pump was manufactured in 2018 or after

driving the turbine and locomotion system

Pool Season Calcium Increaser for Pool & Spa, 8 lb & 25 lb Pool Cleaning & Maintenance Parts watertight fit between skimmer body100% Calcium Chloride, 8 lb or 25 lb A convenient granular product for raising calcium hardness. Addition of this product as required will help protect pool from corrosion & help prevent staining. Raise calcium hardness in water to recommended level Help protect pool surfaces, plumbing, and equipment from corrosive conditions This is available in an 8 lb bag or 25 lb box.