Nature2® Express W28175 Single Cartridge for In-Ground and Above-Ground Express Vessels, 25K gals

Express Single Cartridge for In-Ground and Above Ground Express Vessel is designed to use with Zodiac Nature2® mineral sanitizer cartridge express models W20086 and W20176. This cartridge is designed for pools up to 25,000 gallons and helps to control algae growth, also destroys bacteria, and won't stain the pool.