Universal Standard Size: 10" x 2.5" Deionized Water Filter replacement cartridge fits all standard size RO/RODI units and car flushing systems. It is self-sealing and can be fitted tightly to the system. Visual Design: Color-Changing Deionized Resin (DI Resin) turns tan when depleted, eliminating guesswork on filter usage and letting you know exactly when replacement is needed. Its service life depends on local water quality. Replaceable Filter Media: Our Sturdy & Durable Filter Housing for Extended Service Life features a rotating head, making it easy to pour out spent resin and facilitate timely replacement of filter media. Reduce Total Dissolved Solids to Zero: In the final stage of the RO/DI system, deionized resin is used to reduce total dissolved solids (TDS) to zero. NSF Food Grade Resin: NSF certified, composed of H+ strong acid cationic resin and OH+ strong base anionic resin, maintains 55-61% humidity. Suitable for semiconductor, microelectronics industry, laboratory deionized water, reverse osmosis system after refining, etc. It can achieve almost complete reduction of TDS, reverse osmosis water re-deion, and effectively produce high purity water. Filter 550 gallons of pure water. Excellent Quality and Satisfaction: Filterelated manufactures a wide range of water filtration equipment. Every product that leaves the factory meets our highest quality and standards. The convenient way to provide high quality (pure) DI water DI (deionized) water is the pure water with low TDS (Total Dissolved Solids) or without TDS. It could be used in the variety of domestic and industrial areas (such as laboratory, electronics, car or window rinse, aquarium, etc). Filterelated deionization (DI) cartridges are the best way to make DI water from tap water or RO filtered water through ion exchange process. They are filled with high purified nuclear grade ion exchange resin to deliver high purity water with minimum TOC background. Filterelated DI cartridges could work in 10’ & 20’ standard and big blue housings. In-line DI cartridge works without need of any additional housing.