LiquaGen - 2 Pack Replacement Inline Deionization (DI) Canisters for Universal RO/DI Systems - 1/4" Inlets This product is great for aquariums, laboratory testing, and other applications where ultra-pure water is necessary. 1 year Satisfaction Guarantee, w/ life time support by water technology experts based in California. Each filter will have an individual set of 4 feet of white tubing, clips & 2 elbows for easy installation. Various types of replacement DI can be found on our Amazon Store. This particular green resin is extremely high quality resin compared to the average blue resin. Mixed Bed DI Color Changing Filter In Clear Housing.The anion resin is a Type I strongly basic gel resin with an indicator dye that changes from green to brown as the resin exhausts. The cation component is a strong acid sulfonated polystyrene gel type cation exchange resin.