The MARLO MMB Series Mixed-Bed Deionizer (MBDI) industrial water treatment systems are designed for industrial, ultra-pure deionized water treatment applications where only trace amounts of dissolved solids are allowed. The cation and anion exchange processes take place in a single vessel where extremely high water purity is achievable (up to 18.3 Meg-Ohm resistivity). On-site chemical regeneration of the resin also occurs within the vessels after an automatic separation step.