Product Description RO-PURE 50 GPD (Gallons Per Day) Membrane Filter. Compatible with the Premier RO-PURE Reverse Osmosis System. This filter will work only with RO-PURE system. This semi permeable membrane will effectively reduce a wide range of contaminants such as Arsenic, Lead, Nitrates, Percholate, Chromium, Copper, Dissolved Solids as well as Cysts, such as Giardia and Cryptosporidium. Applications: RO-PURE/WP-RO4 Specifications: Water Production: 50 GPD (Gallons Per Day) Filter Rating: 2-5 Years* Easy to install *Note: Membrane life may vary based upon local water conditions, use patterns, and frequency of filter changes.: Product Note: This product will NOT fit the Watts 1/4 Turn KWIK Change Filter System.