Deionization (DI) RO Reverse Osmosis Filter, Refillable Cartridge. Fits most standard 10" RO & RO/DI Systems including KENT, CoraLife, Seachem, AquaFx, Vertex, SpectraPure. Mixed bed, color exhaustion indicating DI resin. Uses include final polishing of RO water, emergency fast water production, and tap water purifier replacements. Size: 10" x 2" Refillable Cartridge.