Ion Exchange – Are Demineralization and Deionization Different?

By Mike Henley

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This article features two recent discussions on the LinkedIn Ultrapure Water interest group. Mike: “Demineralization versus deionization (DI). Within the high-purity and industrial water fields, one will hear both terms mentioned. Do they have the same meaning, or do they have different meanings? Your thoughts, please.” Dr. V.K.: “As such, ions do not exist in water and it is present in the mineral form. The mineral is normally getting removed from water by means of demineralization, which is the process of removing minerals from water by adopting a system of ion exchange (IX) or reverse osmosis (RO). Sometimes deionization is mentioned in place of demineralization.”

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