Non-Chlorine shock for pools and spas. Available sizes: 25 or 50 lb. pails - select size below. Haviland non-chlorine shock, DuPont™ Oxone® monopersulfate compound is a white granular free flowing peroxygen that provides non-chlorine oxidation for swimming pools and spas. Experience clear water by administering weekly dosage amounts and destroy pool wastes and minimize chloramines from developing and becoming a nuisance. Allows the disinfectant to work on sanitizing, rather than clarifying the water, thus reducing disinfectant usage. Add 1 lb. per 10,000 gallons of water while pool is closed and water is circulating, and in as little as 15 minutes, re-open the pool.