Simply drop the Rx Clear® Mineral Purifier in your skimmer, filter basket, or near water flow for the best result. Cleans your hot tub water naturally and reduces the amount of chlorine or bromine usage by up to 50% meaning longer life to the spa and its components. A combination of silver, copper and zinc kill bacteria as the water in your hot tub flows through the filter. Compatible with Ozone Generators, UV Sanitizers, Salt Generators, Simple Blue and White River products. One stick works for hot tubs/spas up to 600 gallons of water. Each stick last for 4 months, eliminating daily maintenance.