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What is a deionized water system?

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Deionization is simply the removal of ions. Therefore, a deionized water system is a system with water that has no ions. Since ions are regarded as impurities, deionization is considered a way of water purification.

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Ions are electrically charged atoms or molecules found in water and having either a net negative or positive charge. For most of the applications that use water as a rinse or ingredient, these ions constitute impurities and must be removed from the water. Ions with a negative charge are known as anions, and those with a positive charge are called cations. Ion exchange resins are used in exchanging undesirable cations and anions with hydrogen and hydroxyl, respectively, resulting in pure water that is free from ions.

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