Leisure Time Renew Shock Renew is a non-chlorine shock oxidizer. This fast-dissolving granular oxidizer rids spa water of residual soaps, deodorants, natural oils and organic materials that can build up in spa water. When Renew is added to the spa water, it reacts with the bromide and forms a bromine solution to destroy any microorganisms left behind by the bather. 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 use does not affect pH level. Potassium monopersulfate compound formulated with DuPont Oxone