Nature2 W20171 Express Vessel and Cartridge for Above Ground Pools W20176

Copper and silver minerals significantly reduce the amount of chemicals needed to sanitize your pool Installs easily on 1.5-inch or 2-inch rigid PVC pipe plumbing Works in pools up to 25,000 gallons Cartridge should be replaced every season or after 6 months of continuous use For use with Above-Ground pools only