Keep your swimming pool water safe and clean by eliminating dangerous contaminates. Blue Wave's premium stabilized chlorine feature U.V. protection to shield them from the sun's harmful rays and and are manufactured using only the highest quality EPA-approved chlorine. The powerful slow-release 90% chlorine tablets require less frequent application. Blue Wave oversees a strict quality-controlled tabletting process, which guarantees the optimum hardness of each tablet. This ensures proper chlorine dosages 24 hours a day. You will find that Blue Wave chlorine dissolves completely with no residue. It's the best you can buy!