C3 3" Stabilized Chlorine Tablets for Swimming Pools, 15 lbs

C3 3" Stabilized Chlorine Tablets for Swimming Pools, 15 lbs Made of 99% Trichloro-S-Triazinetrione and 90% Chlorine. Contains cyanuric acid (CYA), a stabilizer that prevents UV light from removing existing chlorine Safe to use on swimming pools. Eliminates contaminants keeping the water clean and crystal clear 1 tablet treats 5,000 gallons of water for up to a week