These Chlorine tablets feature powerful 90% Available Chlorine! This best selling chlorine tablet weighs 7 oz. and keeps pool water safe and clean by eliminating dangerous contaminants. The stabilized chlorine is U.V. protected against the sun's harmful rays, and these slow-release tablets require less frequent applications. Each Chlorine Tablet is individually wrapped for your protection. Convenient for use in floaters, automatic feeders, and skimmers. 99% Trichloro-S-Triazinetrione. Available in 25 pound, 50 pound, 100 pound buckets.