Bio -Sanitizer disinfecting tablets from Norweco are scientifically formulated to provide efficient and reliable disinfection for commercial, industrial or municipal wastewater treatment systems. Manufactured from pure calcium hypochlorite, Bio-Sanitizer disinfecting tablets dissolve slowly and evenly, providing effective and economical bacteria killing power. Each tablet contains a minimum of 70% available chlorine to insure maximum effectiveness. Bio-Sanitizer disinfecting tablets are a dependable, long-term source of chlorine. 45 pound pail.