Caldera Spa Monarch Non-Chlorine Shock 5lb Item #73759 Description: This a non-chlorine shock treatment. This fast-dissolving granular rids spa water of residual soaps, deodorants, natural oils and organic materials that can build up in spa water. Features: Quickly dissolves in water to rid spa water of oils and residue. Eliminates organic materials that cause odors, skin and eye irritation. Use spa minutes after application. pH buffered so it does not effect pH level. Buffer potassium monopersulfate compound Formulated with DuPont? Oxone About Caldera Water Care Products: Caldera Spa’s efficient and simple hot tub water care systems make it easier than ever to keep the water in your hot tub fresh and crystal clear.