There are various industrial processes involving the use of demineralised water. Plain water contains various harmful substances such as chlorine and different types of sulphates. It also contains various metal ions. The process of ion-exchange removes such chemicals from water and produces demineralised water. This is why demineralised or deionised water is used in the production of different types of cosmetics and medication. Demineralised water is also used for the preparation of special...