Super Zappit calcium hypochlorite granules by PPG Industries are specifically designed as a swimming pool shock or superchlorination treatment and contains a minimum 73% available chlorine. Super Zappit is highly effective against bacteria, algae, slime, fungi and other harmful and objectionable microorganisms. The fast dissolving 1 lb bag treats 15,000 gallons and helps restore a crystal clarity to pool water and will serve as a disinfectant for cleaning pool sides and bottoms, decks, diving boards, ladders, and floats.