The Electro-Deionization process is the latest technology in deionized water treatment to achieve ultrapure water. The Marlo EDI Series Electro-Deionized Water Treatment Skids use ion exchange resins in the presence of a DC voltage potential to remove cation and anion contaminants from the feed water supply. Ion-selective membranes are then used within the modules to continuously remove these contaminants and carry them out in a small concentrate stream. The voltage applied across the cell allows for the electrochemical “splitting” of water into hydrogen (H+) and hydroxide (OH-) ions within the ion exchange resins resulting in constant regeneration without the addition of chemicals, wastewater neutralization/disposal, and shutdown time. This results in a major advantage over the operation of traditional, regenerable Mixed-Bed Deionization and Service Exchange DI Systems.