Rx Clear’s Chlorine Free oxidizing shock treatment is made up of 36.2% Potassium Monopersulfate and is free of calcium as well as chlorine. Non chlorine shock works by oxidizing organics before they can combine with chlorine and form chloramines. This soluble formula replaces superchlorination and destroys irritating and odorous chloramines in your water making it free and available to sanitize. This product is best used for indoor pools and spas which see little to no direct sunlight causing chlorine to dissipate slower than it otherwise would in an outdoor swimming pool. Dosage Completely soluble, you add 1 lb of Chlorine Free Shock per 10,000 gallons of pool water. Use the following formulas below to find out the number of gallons of water in your pool: Rectangular = Length x Width x Height x 7.5 Round = Diameter x Diameter x Height x 5.9 Oval = Length x Width x Height x 5.9 Our Mission Statement Rx Clear strives to provide quality products for a safer, cleaner, and more enjoyable swimming experience. When it comes to correcting your swimming pool, Rx Clear does it all giving you crystal clear water that fits your needs. Benefits Does not require pre-dissolving before adding to your pool; the shock instantly dissolves in your pool water. Dispense the amount required around your pool. Safe to swim 10 minutes after use. Apply Chlorine Free Shock when your chlorine level reaches 0.2 ppm or higher. A chlorine test kit will help you calculate chlorine levels in your swimming pool. Chlorine Free Shock improves pool and spa water quality without the risk of bleaching vinyl liners.