CCH® 1” Tablets leverage the power of Calcium Hypochlorite (Cal Hypo) to chlorinate consistently, increase calcium to protect plaster, and balance alkalinity to stabilize pH. This 3-in-1 solution is one of the most widely used chemicals for sanitizing pool and spa water and is the only sanitization method that chlorinates, removes organics and metals, boosts hardness and shock treats in one process.