Nature2 W20171 Express Vessel and Cartridge for Above Ground Pools W20176

Copper, silver and 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 onlyYou may also like Nature2 Zodiac A30 W28165 Aboveground Mineral Cartridge Sanitizer 30K Gallon.