SpaGuard Spa Shock Oxidizer 7lb (New Size! Your order will be substituted with a 7lb SpaGuard Spa Shock, 5lb no longer available.) This non-chlorine shock is the ideal oxidizer for spas with an ionizer unit. It makes undesirable compounds disappear. Spa Shock is simple to use - just apply directly into your spa water while the pump is circulating. Try Spa Shock in two convenient sizes of 40-oz and 5-lbs. Can be used with chlorinated or brominated spas, does not raise chlorine residual, quick dissolving shock treatment, destroys organic contaminants, non-chlorine sanitizer. Product Information: 31% potassium peroxymonsulfate Approximately 3.2% active oxygen pH 8.6 Non-chlorine oxidizer Can be used with chlorinated or brominated spas Does not raise chlorine residual Quick dissolving shock treatment Destroys organic contaminates (Note: This product does not replace the need for regular application of chlorine or bromine sanitizer) Directions for use: For initial treatment 1. Apply 2 ounces per 300 gallons with the pump running 2. Run pump for 15 minutes after addition For routine maintenance 1. Apply 1 ounce per 300 galloons weekly 2. For heavily used spas, treat twice weekly