Granula Stabilized Chlorinator - 3 Pack ClearRay® Chlorinating Granules is a sanitizer specially formulated for fast action. These highly soluble granules immediately dissolve upon application, providing quick and effective sanitizing to your spa or swim spa. They rapidly oxidize and remove organic contaminants such as body oils, cosmetics, and perspiration. Ideal for regular maintenance, ClearRay® Chlorinating Granules consistently keep chlorine levels balanced between 1 to 3 ppm . For optimum results, add after each spa use and maintain routine testing. When used as directed, this product is effective as a spa and hot tub water disinfecting agent. Directions for Use: For maintenance doses, with pump on, add 1/2 teaspoon of this product per 100 gallons of water (or 5 teaspoons per 1,000 gallons) as an initial treatment. Repeat at 15 to 20 minute intervals until a residual of 3-5 ppm of available chlorine is established as determined by test kit. A test kit must be used regularly to determine the frequency of additional doses of this product needed to maintain the chlorine residual of 3-5 ppm. SUPERCHLORINATION: Use one teaspoon of this product per 100 gallons of water (or 1/4 cup per 1,000 gallons). Superchlorination may be needed on a nightly basis in a heavily used spa or as infrequently as once a week in a moderately used spa.