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Demineralization is the removal of all cations (e.g. calcium, magnesium, sodium, potassium, iron and other heavy metals) and all anions (e.g. bicarbonate alkalinity, chloride, sulfate, nitrate, silica and CO2) from a solution, typically water. The cations are replaced with H+ ions and the anions are replaced with OH- ions to form water. This reduces the total dissolved solids of the solution.
There are many applications where the cation and anion resins can mix together in a single vessel as a mixed bed. This configuration can be used for primary demineralization or as a polishing step following a two bed or multi-bed system.
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