Deionization (DI) resin is necessary to reduce Total Dissolved Solids (TDS) to zero and is the last stage of the water filtration process. You can add this IceCap 1.25 lb Deionization Resin to the IceCap RO/DI Refillable DI Cartridge. It will fill the Cartridge once. IC-RI-DIRES125. 1.25 lbs.
