The CR Spotless Replacement Cartridges are the easiest way to replace spent resin with fresh, new resin. Simply unscrew the housing and remove the spent cartridges. Put the new cartridges inside and reattach the housing to the main unit. You're now ready to de-ionize another 300 gallons of water.
Your purchase includes two 20 inch replacement cartridges. These cartridges fit both the DIC-20 High Output Rolling System and the DIW-20 Wall Mounted System.