Water resulting from the removal of contaminants in the water by a double-bed ion exchanger. The ion exchanger switches H+ (hydrogen) ions for positive impurity ions and OH- (hydroxide) ions for negative impurity ions. The H+ ions and OH- ions then combine to form HOH (H O). Deionized water is equivalent in purity to distilled water but is much less costly to produce.
(4) chemically or electrochemically purified water used in chemical analysis to avoid contamination of the materials being tested.
Water that has been propelled through active resin beds to remove metallic ions, exposed to ultraviolet light to kill micro-organisms and filtered through a submicron filter to further remove impurities.