Nature2 Inground replacement cartridge is designed to fit the Professional inground units (W25904 and W20011) easily and effectively lowers chlorine consumption. The Nature2 technology uses silver and copper to sanitize your pool water lowering the chlorine necessary to keep your pool clean and clear saving you time and money.
* For pools up to 45,000 gallons
* Simple and quick installation
* Lasts up to 6 months
* Lower your chlorine consumption