Demineralised water system

What is demineralised water?

Demineralised water is purified water from which most salts (minerals) have been removed. As a result, demineralised water does lose its buffering capacity, so the pH of demineralised water drops when it comes into contact with air, among other things. The advantage is that the conductivity of demineralised water and alkalinity decreases, and there is no longer any hardness (limescale) present. The main difference between osmosis water and demineralised water is that the conductivity of demineralised water is lower than that of osmosis water. 


Demineralised water is produced utilising a demineralised water system. Demineralised water is so pure that minerals such as salt and lime do not enter the techniques and settle.  


Difference between reverse osmosis and demineralized water

Osmosis water is produced by a Reversed Osmosis installation, while demineralized water is produced using flow-through resin (anions/cations). The latter is regenerated in time so that the quality of the demineralised water is always “improved”. The conductivity of microsemes in demineralized water is less than 2μS (microsiemas), the conductivity of microsiemas in osmosis water, on the other hand, is between 15-30 microsiemas, depending on the water quality. In short, the conductivity of demineralized water is lower than that of osmosis water. 

How is demineralised water made?

Demineralized water is produced in three ways:

  •  By ion exchange with a special resin, positive ions are replaced by hydrogen ions, and negative ions are replaced by hydroxide ions.
  • Ion exchange also takes place during electrodeposition. An electrical current is passed through the resin to maintain the resin’s regeneration. Unwanted ions move from the reaction surface to the electrodes.
  •  By membrane filtration: usually in a few steps.


Demineralization must take place in different phases in order to obtain the right quality of demineralised water. The use of membrane filtration has the advantage that in general no chemicals are needed to produce demineralised water (if necessary for cleaning at the most). The downside is the amount of (electrical) energy required for the process.



Demineralisation Systems from Grünbeck

Grünbeck supplies demineralised water installations from a very small 125l/hour up to installations of >400m3/hour. Grünbeck’s installation is very compact; 140x40x50 cm and the conductivity of the demineralised water <9 mS/cm is perfect.


A demineralized water device can be expanded with a pressure boosting installation, a softening installation, an ultrafiltration unit, an electro-deinosator and UV disinfection. This way you get demi water, i.e. water that does not contain minerals, specialized for your process.


Curious about the price of a demineralised water installation? Then download the brochure!


The knowledge article on demineralized water systems is also available in Dutch.

Omgekeerde Osmose installatie voor gedemineraliseerd water

AVRO-flex 400


Omgekeerde Osmose installatie voor gedemineraliseerd water



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