12 Pack Advanced Pool Shock, 68% Calcium Hypochlorite – Fast-Acting Shock Pool Treatment, Quick-Dissolving Chlorine Granules for Inground & Above Ground Swimming Pools, 12 x 1 lb Bags (12 lb Total)

[Fast-Acting Pool Shock Treatment] Made with Calcium Hypochlorite (Cal-Hypo) containing 68% available chlorine. Each 1 lb pre-measured bag delivers powerful, mess-free chlorine shock for swimming pools—no measuring or scooping needed.[Crystal...