Demineralised water, also known as deionised water (DI water), is water that has had its mineral ions removed. The process of demineralisation involves removing dissolved salts, such as calcium, magnesium, sodium, and other ions, as well as non-salt ions like silica and carbonates. This purification process typically involves either distillation or ion exchange.

In distillation, water is boiled, and the steam is condensed back into liquid form, leaving behind impurities. In ion exchange, resins are used to exchange ions in the water with other ions, effectively removing the mineral content.

Demineralized water is often used in various industrial processes where the presence of minerals could cause issues, such as in the pharmaceutical, electronics, and chemical industries. It is also used in laboratories for experiments and in medical applications where pure water is required. Additionally, demineralized water is used in steam irons and car batteries to prevent mineral buildup and corrosion.

It’s important to note that while demineralised water is free from minerals, it can still contain other impurities such as bacteria, organic compounds, and gases, so it may not be suitable for drinking without further treatment or purification.