DI Resin is necessary to reduce Total Dissolved Solids (TDS) to zero and is the last stage of an RO/DI unit. It is not necessary to use the expensive proprietary DI cartridges that other RO manufacturers sell. Simply buy a refillable DI cartridge if you don't have one already and fill with DI resin. You'll save money and get the same results.
Nuclear Grade Mixed Bed DI Resin
1.5 Gallon (7lbs) - Fills 6 standard 10" refillable cartridges
1.25 lbs. - Fills 1 standard 10" refillable cartridge
Vacuum packed in foil-lined 4mm Mylar bags to preserve quality (see Full Details for more info)