Applied Biochemists Shocktrine is a 100% potassium monopersulfate (MPS) shock oxidizer that destroys non-filterable organic contaminants such as cosmetics, perspiration, hairspray, suntan oil, urine, and leaves. It prevents the formation of combined chlorine that causes skin and eye irritation, cloudiness and odors. This product allows swimming immediately after treatment, and is formulated specifically to not bleach vinyl liners. Best of all, Shocktrine doesn't add any chlorine to your pool, making it perfect for bromine pools.