Demineralised water is
water that has been purified in such a way that (most of) its mineral- and salt ions are removed. You can think for example of Calcium, Chloride, Sulphate, Magnesium and Sodium. Demineralised water is also known as demi water or deionised water.
Reverse Osmosis (RO) is used to partially clean-up tap water to make it
roughly 90% to 99% pure. ... Deionization (DI) filters exchange positive hydrogen and negative hydroxyl molecules for positive and negative contaminant molecules in water.
