2 Pack Replacement Inline Deionization (DI) Canisters for Universal RO/DI Systems - 1/4" Inlets | Engineered for Zero TDS Ultrapure Water | Easy Filter Change

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. ONLY USE AFTER PROPER REVERSE OSMOSIS PRE-TREATMENT 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 blue to brown as the resin exhausts. The cation component is a strong acid sulfonated polystyrene gel type cation exchange resin.