Ultra Pure Pakistan is a leading provider of deionization solutions. Our water deionizers are rugged, pre-engineered, pre-assembled, standardized units that minimize expensive installation and start-up costs. We have designed our Deionization systems to maximize the efficiency and repeatability of the unit during the service and regeneration modes

The Process of Deionization or Ion-exchange

In the context of water purification, ion-exchange is a rapid and reversible process in which impurity ions present in the water are replaced by ions released by an ion-exchange resin. The impurity ions are taken up by the resin, which must be periodically regenerated to restore it to the original ionic form. (An ion is an atom or group of atoms with an electric charge. Positively-charged ions are called cations and are usually metals; negatively-charged ions are called anions and are usually non-metals).

The following ions are widely found in raw waters:

                Cations Anions

                Calcium (Ca2+)                 Chloride (Cl-)

                Magnesium (Mg2+)        Bicarbonate (HCO3-)

                Sodium (Na+)                   Nitrate (NO3-)

                Potassium (K+)                Carbonate (CO32-)

                Iron (Fe2+)                         Sulfate (SO42-)

Ion Exchange Resins

There are two basic types of resin – cation-exchange and anion-exchange resins. Cation exchange resins will release Hydrogen (H+) ions or other positively charged ions in exchange for impurity cations present in the water. Anion exchange resins will release hydroxyl (OH-) ions or other negatively charged ions in exchange for impurity anions present in the water.

The application of ion-exchange to water treatment and purification

There are three ways in which ion-exchange technology can be used in water treatment and purification: first, cation-exchange resins alone can be employed to soften water by base exchange; secondly, anion-exchange resins alone can be used for organic scavenging or nitrate removal; and thirdly, combinations of cation-exchange and anion-exchange resins can be used to remove virtually all the ionic impurities present in the feedwater, a process known as deionization. Water deionizers purification process results in water of exceptionally high quality.


For many laboratory and industrial applications, high-purity water which is essentially free from ionic contaminants is required. Water of this quality can be produced by deionization.The two most common types of deionization are:


  • Two-bed deionization
  • Mixed-bed deionization


Two-bed deionization

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 cation column, whereupon all the cations are exchanged for hydrogen ions.To keep the water electrically balanced, for every monovalent cation, e.g. Na+, one hydrogen ion is exchanged and for every divalent cation, e.g. Ca2+, or Mg2+, two hydrogen ions are exchanged. The same principle applies when considering anion-exchange. The decationised water then flows through the anion column. This time, all the negatively charged ions are exchanged for hydroxide ions which then combine with the hydrogen ions to form water (H2O).

Mixed-bed deionization

In mixed-bed deionizers the cation-exchange and anion-exchange resins are intimately mixed and contained in a single pressure vessel. The thorough mixture of cation-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 feedwater, 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.

Electrodeionization EDI Electrodeionization Systems remove ions from aqueous streams, typically in conjunction with reverse osmosis (RO) and other purification devices. Our high-quality deionization modules continually produce ultrapure water up to 18.2MW/cm. EDI may be run continuously or intermittently.

Water Deionizer System

Lead-Acid Battery Water Deionizer System
Maximize battery performance with pure water from the tap.

Our Deionizer reduces the high price of buying bottled water and is more convenient. Each disposable cartridge purifies about 600 gallons of water (2400 liters). Why let impurities in your water reduce the life of your battery, when this system is so easy to use and cost effective?

Easy To Use:

Comes with everything you need to make pure water from the tap
Operates at full-line pressure to dispense water directly from the deionizer
Quick cartridge replacement requires no tools
20 ft. output hose allows maximum watering flexibility and convenience
Optional watering gun lets you fill a battery directly from the deionizer

How Does it Work?

Inside the Deionizer, tap water is passed through a cartridge containing beds of cationic and anionic resins which electrostatically remove impurities. The result is very pure water. When the cartridge is exhausted, simply replace it with a fresh one. Cartridges are available for a fraction of the cost of distilled water, enabling you to produce your own pure water for less money than it would cost to buy it.

Why Use a Deionizer for Battery Water?

Metallic impurities in water can poison the battery, affect cell voltages and increase self-discharge, all of which can result in shortened battery run time and reduced battery life. Calcium and magnesium compounds found in hard water may cause mossing and dendrite growth through the separators. Note that these impurities are dissolved in the water and cannot be removed by conventional filters.
Using deionized water is a simple and effective way to maximize battery life.

Features & Benefits:

A professional-quality deionizer – not just a filter, which only removes particles – but a real ion-exchange medium which electrostatically removes dissolved impurities. Purity is comparable with distilled water and ideal for batteries.

Large capacity: The cartridge is over 2 feet long (60 cm) and rated for 600 gallons (2400 liters) of pure water. Actual output varies with tap water quality.

Purity Light: There is no better purity control available at any price. See below for details.

Pressurized system: Unlike some lab-type systems, the PS-300 cartridge takes full line pressure up to 80 psi. The water flow is fast enough to use directly with the battery watering gun.

Ready to use: The system comes with a mounting plate, one cartridge, Purity Light, hose hanger, quick connects, input and output hoses. With the optional Watering Gun, you can fill a battery directly from the Deionizer.

Easy installation: Setting up the wall-mounted system takes 3 simple steps. Attach the mounting plate to wall with 2 bolts. Connect input hose to any tap with standard hose fittings. Connect Purity Light to the output assembly.