Blue Wave®’s premium stabilized chlorine features U.V. protection to shield it from the sun, and is manufactured using only the highest quality, EPA-approved chlorine. Blue Wave® oversees a strict quality-controlled tabletting process, which guarantees the optimum hardness of each tablet. This keeps tablets from dissolving too rapidly and 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!