Demineralized water （desalted water）refers to the finished water obtained by removing various impurities such as suspended solids, colloids and inorganic cations and anions by various water treatment processes. Demineralized water does not mean that the salt in the water is completely removed. Due to water purify technology and the consideration of water producing cost, the demineralized water is allowed to contain trace impurities depending on the application. The less impurities in the demineralized water, the higher the purity of the water.
The hardness of water is mainly formed by the cations: calcium (Ca2+) and magnesium (Mg2+) ions. When the raw water containing hardness cations passes through the resin layer of exchanger, the calcium and magnesium ions in the water are adsorbed by the resin, and the sodium ions are released, so that the water flowing out of the exchanger is softened water, The hardness of the water is reduced, but the total salt content is unchanged.
In a short, demineralized water is the water that removes or reduces the salt; softened water is the water that removes or reduces the hardness ion, but salt content unchanged.
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