As a stabilized chlorine sanitizer, it leaves a beneficial chlorine residual in the water that continually destroys new bacteria entering the pool, protecting swimmers from potentially harmful contaminants therefore making it an essential part of any pool care program. Ideal for all pool surfaces. Low cost and easy to use. Tablets are self-stabilized. The 90 percent available chlorine is released when the product is dissolved in water. Strong, effective and economical disinfectant that works continually to kill harmful bacteria, aids in algae control, destroy the organic contaminants in water and helps keep the pool clean and clear.