Deionised Water

25th October 2018



An image showing Deionised Water in a 5 litre container

About Deionised Water

Deionised water is water that has had almost all of its mineral ions removed, including calcium, sodium, iron, copper and chloride. It is often confused with demineralised water, which is water that has had all of its minerals and contaminants removed.

Although deionised water has had most of its ions removed, it still cannot be classed as entirely pure. Our demineralised and ultrapure waters are recommended alternatives for when higher grade water is required.

Uses of Deionised Water

Often abbreviated as DI, deionised water is used for a range of applications. It is regularly used in laboratory and pharmaceutical environments to prepare chemicals and mixtures. Deionised water is also used to test certain substances for specific compounds.

DI water is also used

  • In acid and alkaline batteries
  • In flushing and topping up car cooling systems
  • In household detergents
  • In perfumes and other cosmetics

Production & Testing of Deionised Water 

We make deionized water using a several step filter process. We first use an organic trap, where a special resin removes most of the organic matter.  The water then passes through a twin-bed deionizer, where one anionic tank removes the cat ions whilst the other cationic tank removes the anions.

By now, the maximum level of impurities in the water is 10 µS/cm which already much lower than traditional distilled water. At this point, the water is can be called deionised.

To further reduce impurities, the water is passed through a mixed bed resin, where impurities are reduced to > 0.05 µS/cm.  The deionized water is given ultraviolet treatment, passing through a strong UV light to kill any remaining micro-organisms.

Finally, the water moves through a 0.2 micron filter.  After the final stage, the water is Ultrapure – this can be purchased from us here.

Buy Deionised Water Online

Reagent are trusted UK suppliers of deionised water with over 40 years of experience in the handling and distribution of chemicals. Buy in 25L containers, 1000L IBCs or bulk tankers. Alternatively, contact our expert sales team to talk about your bespoke requirements. Orders can be placed online or by phone.

Deionised water is the lowest quality water we use.  For many of the chemical solutions and chemical reagents we manufacture, we tend to use ultrapure water. If you have questions about which water is best suited for your needs, don’t hesitate to give us a call.


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