* 99% Trichloro-s-triazinetrione * Available Chlorine: 90% * 3-inch slow dissolving chlorinating tablets with 90% available chlorine which kills bacteria, destroys organic contaminates and controls algae. For use in automatic chlorinators, floaters, and skimmers. * Kills bacteria, destroys organic contaminants and controls algae * Sun protected for extended chlorine life * Concentrated * Stabilized