R6-20 Six Replacement Resin For DIW/C-20Replacement Resin The resin replacement bags are easy to install and virtually hassle free. You can change the resin in less than 5 minutes. Simply unscrew the watertight housings and remove the resin cartridges. Properly dispose of the used resin, rinse cartridges, and refill with new resin. Then, put the cartridges back inside the housings and reattach them to the body of the unit. Youll receive 6 replacement bags that will deionize approximately