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Ion exchange chromatography is a technique used in water treatment to remove impurities and unwanted ions from water. It is a process that involves the exchange of ions between a solid phase (resin) and a liquid phase (water). The resin is made up of a matrix of positively or negatively charged ions, which are exchanged with the oppositely charged ions in the water. This process can be used to remove a variety of ions from water, including calcium, magnesium, sodium, chloride, and sulfate. Ion exchange chromatography is a versatile and effective technique that can be used to improve the quality of water for a variety of applications, including drinking water, industrial water, and wastewater treatment.