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Deionised water is the product of water that has had its minerals and ions removed. This makes it a highly purified form of water that is ideal for many uses. Deionised water is often used in scientific laboratories and industry because it does not interact with other substances in the same way as regular water.
This means that it can be used as a solvent or in other processes where regular water would interfere. Deionised water is also often used in domestic settings, as it can improve the taste of drinking water and help to prevent limescale build-up in kettles and pipes.