DI Tank Systems. Deionization ” also known simply as “DI” ” is a technique used to remove a large number of contaminants from water. A DI tank contains one of two types of special resin (or a mix of the two), each of which removes positively or negatively charged particles from the water.Click to see full answer. Subsequently, one may also ask, how does a DI water system work?Deionization is a chemical process that uses ion-exchange resins which are specially manufactured, and exchange hydrogen and hydroxide ions for the dissolved minerals. Then, it recombines again to form water. But if you use specially-made and strong base anion resins, then it can remove even gram-negative bacteria.Likewise, what are two concerns with using DI tanks? The DI tank has 2 flaws that relegate it to “back up status” instead of as a primary component of the water treatment system. First, the DI tank cannot sterilize water. Unlike an RO tank which can remove bacteria, virus particles and endotoxins, the DI tank can only exchange cations/anions for H+ and OH-. Hereof, what is a DI water system? Deionized (DI) water is water that has been treated to remove all ions – typically, that means all of the dissolved mineral salts. Distilled water has been boiled so that it evaporates and then re-condensed, leaving most impurities behind.What does DI resin remove?Deionization removes total dissolved solids (TDS) from water using ion exchange resins, controlling the electric charge of ions in the water to remove the TDS.