Powerful non-chlorine shock
Use Renew Shock weekly to eliminate contaminants in your spa and to restore the water to a clear, fresh look. Can be used in conjunction with Go Brom as part of a 2-part sanitation system that is completely chlorine free. Active Ingredients: Potassium Monopersulfate Dosage rate: 2 oz. per 500 gallons or more frequently during periods of heavy bather loads.