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Ion exchange chromatography is a water treatment technique that uses a solid resin to remove ions from water. The resin is made up of small beads that are coated with ion-exchange groups. These groups are capable of exchanging ions with the ions in the water. As the water passes through the resin, the ions in the water are exchanged for the ions on the resin. This process continues until all of the ions in the water have been removed.Ion exchange chromatography is used to remove a variety of ions from water, including calcium, magnesium, sodium, and chloride. It is also used to remove heavy metals, such as lead and mercury. Ion exchange chromatography is a very effective water treatment technique and can be used to produce high-purity water.