Demineralized water is water that has had most of its dissolved minerals and salts removed. It's also known as deionized water or demi water. 

How it's made

  • Demineralized water is created by passing water through a column that contains a resin that binds to the water's ions. 
  • The process is called ion exchange (IX) and uses both cation and anion exchange resins. 
  • The process is chemically and electrically driven by DC current. 

What it's used for 

  • Demineralized water is used in many industries, including chemical, food, pharmaceutical, and cosmetics.
  • It's used as a rinse water, boiler water, cooling water, and test water.
  • It's also used as a raw material, ingredient, and solvent in the pharmaceutical industry.
  • Demineralized water is important because it's used in applications where water quality is critical. 
  • However, it's not suitable for drinking because it lacks essential minerals like calcium, potassium, and magnesium.