RELIABLE : 
Demineralization (DM) is the process of removing minerals, salts ( such as cations -
sodium, calcium, iron, copper, and anions such as chloride, sulphate, nitrate, etc) from
Water by using one of the following processes :
- Ion Exchange ( Cation- Anion- Mixed Bed) Treatment
- Membrane Filtration (Like Reverse Osmosis followed by MB )
- Electro DeIonisation (EDI)- RO+ EDI
- Distillation / Evaporation
Ion Exchange: Demineralised (DM) Water known for typical conductivity < 30
umhos/cm . Deionised (DI) Water is known as more purified DM water with the help of
a Mixed Bed (MB )unit or Electro De-Ionisation (EDI). MB-based DI water produces
Conductivity < 5 umhos/cm. EDI-based DI water produces Conductivity < 0.5 umhos/cm.
