Optipure WSB-20; Replacement cartridges; 20″ x 4 ½” – 5,200 grains

The WS-20B is a 4.5” x 20” Drop-In cartridge that utilizes a high-capacity ion-exchange resin to remove hardness minerals that cause scale from water. The cartridge has 5,200 grain (88,920 mg/L) capacity at flow rates up to 2.0 gpm.