HTH 18 Lb. Ultimate Mineral Brilliance Chlorine Granule

Effective 7-in-1 sanitizer for swimming pools. Enhanced formula contains a built-in clarifier, stain and scale preventer, water softener, sanitizer, visible blue action, algae controller, and is fast dissolving. 56% calcium hypochlorite with 44% other ingredients. Minimum available chlorine 52.5%.