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Envirotech DM plants are ion exchange process plant for the removal of  minerals from the water .Strong acid cation + Strong base anion resin systems.
These systems consist of two vessels - one contains cation-exchange resin in the hydrogen (H+) form and the other contains anion resin in the hydroxyl (OH-) form (see picture below). Water flows through the cation column, where all the cations in the water are exchanged with hydrogen ions. The decationised water then flows through the anion column, here negatively charged ions are exchanged for hydroxide ions which then combine with the hydrogen ions to form water (H2O). These systems remove all ions, including silica. 

In general the strong acid cation and strong base anion resin system is the simplest arrangement and DM water that may be used in a wide variety of applications can be obtained with it.
Envirotech offers two most common types of deionization which are:


The two-bed deionizer consists of two vessels - one containing a Cation-exchange resin in the hydrogen(H+) form and the other containing an anion resin in the hydroxyl (OH-) form. Water flows through the caution column, whereupon all the captions are exchanged for hydrogen ions. To keep the water electrically belanced, for every monovalent Caution, e.g. Na+, one hydrogen ion is exchanged and for every divalent caution, e.g. Ca2+ , or Mg2+, two hydrogen ions are exchanged. The same principle applies when considering anion exchange. The desalinized water then flows through the anion column. This time all the negatively changed ions are exchanged for hydroxide ions which then combine with the hydrogen ions to form water (H2O).


  • Foundries
  • Food & Beverages
  • Pharmaceuticals
  • Plating plants
  • Paper & Pulp Industry


mixed-bed deionizers the caution-exchange and anion-exchange resins are intimately mixed and contained in a single pressure vessel. The thorough mixture of Caution-exchangers and anion-exchangers in a single column makes a mixed-bed deionizer equivalent to a lengthy series of two-bed plants. As a result, the water quality obtained from a mixed-bed deionizer is appreciably higher than that produced by a two-bed plant.

Although more efficient in purifying the incoming feed water, mixed-bed plants are more sensitive to impurities in the water Supply and involve a more complicated regeneration process. Mixed-bed deionizers are normally used to 'polish' the Water to higher levels of purity after it has been initially treated by either a two-bed deionizer or a reverse osmosis unit.


  • Ion exchange Vessels
  • Cation Resin of reputed make
  • Automatic / Semiautomatic
  • Multiport valves / High quality Upvc piping & Valves
  • PLC based control panel

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