Obtain ultra high-purity water with these high-capacity ion exchange filters. Color-changing media, when applicable, give you an easy visual indication of exhaustion. The clear body and white endcaps are both made of resilient polycarbonate. Comparible to EDC, IWT, and US Filter single- and dual-bracket water filtration systems and compatible with their holders. Place cartridges individually or in series to obtain purified water to meet your application needs. Suggested Combinations A) Use one pretreatment and one high-capacity cartridge in series to produce water free of all ionized constituents except free CO2 and silica. B) Two high-capacity and two high-purity cartridges operating in tandem increase deionization capacity by 15%. Recommended for use with water that has a mineral salt concentration of 10 grains per gallon or more. C) Cation removal cartridge removes 99% of metallic, ammonia, and other cationS.