DI Cartridge, For Use With Pentek 150069-75, Pentek 150156-75, Application Demineralization, DI, General laboratory grade water, glassware rinsing, hydrogen generators,stability chambers, battery filling, glycol purification The Aries Filterworks AF Series high-purity deionization filter cartridge uses ResinTech(R) mixed-bed resins to help ensure high-purity, demineralized water for commercial applications and laboratory use. The mixed-bed deionizers help produce water with very low ionic concentrations. The cartridge is constructed with premium media to help ensure long-lasting service life. Double-open end cartridge fits standard residential and industrial housings.