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The process used for removal of all dissolved salts from water is referred to asdeionization. Deionization requires the flow of water through two ion exchange materials in order to affect the removal of all salt content.
Deionization. The terms demineralization and deionization are used somewhat interchangeably by the industry. While the term demineralization is generally better understood, deionization is especially apt.
The passage of water through the first exchange material removes the calcium and magnesium ions just as in the normal softening process. Unlike home equipment, deionization units also remove all other positive metallic ions in the process and replace them with hydrogen ions instead of sodium ions.
Deionized water has a wide range of uses in industry. Chemical production, pharmaceuticals, electroplating, television tube production and leather goods processing are among the many diversified applications for deionized water.
Efforts to produce mineral-free water through multiple distillation have proved to be extremely complex and require elaborate and costly equipment.