The process used for removal of all dissolved salts from water is referred to as deionization or demineralization. Deionization requires the flow of water through two ion exchange materials in order to affect the removal of all salt content. Aries Twin Bed Deionization cartridges use ResinTech® are made up of strong acid cation (SAC) and weak base anion (WBA) resins in a two-bed, layered cartridge. While not yielding the resistivity of mixed-bed DI cartridges, twin beds cartridges are ideal for consistent, low-grade deionization. Sized to fit standard Slim and BB housings. Sized to fit standard Slim and BB housings.