GLB Oxy-Brite is a non-chlorine shock producing crystal clear water, shock treating all in one easy step. This powerful shock rids pool water of contaminants that cause odor and irritation and its unique blue water brightening crystals produce clearer water. Made with 42% Potassium Peroxymonopersulfate. Available and packaged in 1-lb. bags.From the ManufacturerA non-chlorine shock oxidizer that creates sparkling water and oxidizes contaminants all in one step. The powerful formula rids pool water of contaminants that cause odor and irritation, and brightens and clears the water with unique blue water brightening crystals. Oxy-Brite, made with DuPont Oxone, is a potassium monopersulfate-based shock oxidizer. It oxidizes like chlorine, but actually reactivates a small amount of spent chlorine and won't deplete the chlorine residual. Used weekly, Oxy-Brite will continually oxidize contaminants thus requiring less sanitizer throughout the week to maintain clean water.