New Wave 3-inch Tablets has Powerful 90% Available Chlorine! Tablet weighs 7 oz. and keeps pool water safe and clean by eliminating dangerous contaminants. Stabilized chlorine is U.V. protected against the sun's harmful rays, and these slow-release tablets require less frequent applications. Each tab is individually wrapped. Convenient for use in floaters, automatic feeders, and skimmers. 99% Trichloro-S-Triazinetrione.New 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!