Check the listing for details. DI Refill Resin For Spot Free Car Washing System. Condition: New. Listed at 22.50 USD. DI Refill Resin For Spot Free Car Washing System Description Color Changing Mixed Bed DI 10-Inch Cartridge is the most effective and easy to use DI cartridge available - filled with MBD-30 Nuclear Grade resin. Features: Cation and Anion resins (H+ and OH-) remove the remaining total dissolved solids (TDS) from membrane-filtered water. 10" standard cartridge size includes a top gasket for a secure fit, and NEW Cartridge housing shape lends itself to efficient water-to-resin contact, while the NEW Opaque cartridge takes the guess work out of determining when resin is exhausted. Aquatic Life MBD-30 Nuclear Grade Resin changes from blue to yellow, then tan to white when depleted. SUITABLE FOR USE ON ANY VEHICLE – Hard water spots are no match for this deionized water system. It’s an excellent choice for cleaning a car, truck, motorcycle, RV, motorhome, bicycle, even the outside of your windows at home.EFFECTIVELY REMOVES TDS IN WATER – When water passes through the resin, TDS (total dissolved solids) are removed. Each cartridge will remove approximately 1,800-2,000 TDS before you need to replace the resin.When the resin in the cartridges is used up, they’ll turn a tan color. Listing and template services provided by inkFrog