Stefani 1 Micron Green Carbon Universal Replacement Cartridge suits all Stefani Under-Sink Systems that take 250mm cartridge (single, double, triple and reverse osmosis). In addition, cartridge will fit Stefani On-Bench Digipure Systems. Replacement cartridge not only integrates with Stefani, but can also fit filtration system's using standard 250mm filter cartridges. Chlorine reduction performance tested and verified by independent laboratory. Environmentally friendly components produced with a new technology that carbonises dried coconut shells in an enclosed self-sustaining system, whilst capturing and converting the emissions into useful thermal energy. Producing the purest filtered water available for cooking and drinking, resulting in water quality equal to bottled water in your home for a fraction of the cost.