An Effective, Shock Oxidizing Treatment - 3 Pack ClearRay® Oxidizing Shock is a powerful oxygen-based oxidizer. When used regularly, this product will help reduces contaminants introduced by bathers and environmental factors like rain and wind. This product will not raise chlorine levels or produce combined chlorine. This product is gentle on spa surfaces. This product restores sparkle and clarity to spa water. It will not increase calcium hardness or stabilizer levels. This product contains no chlorine or other disinfectants. Add this product to spa water after every use, or once per week if the spa is not being used. How To Use ClearRay® Oxidizing Shock 1. Every time the spa is used it must be oxidized. After every use, add 2 ounces of this product per 300 gallons of water. NOTE: Apply the required amount of this product evenly throughout the spa with the pump running. Add the full amount at one time using a clean and dry plastic scoop. 2. Run the pump for at least 30 minutes. 3. Turn the jets on and o once or twice after adding this product to improve the treatment.