Deionized Water


First of all what is DI Water?


Ions are electrically charged atoms or molecules found in water that have either a net negative or positive charge. For many applications that use water as a rinse or ingredient, these ions are considered impurities and must be removed from the water. Common water contains several ions that are impurities for industry process purposes. You can find some element ions like:

Calcium, Chlorides, Magnesium, Sulfates, Iron, Nitrates, Manganese, Carbonates, Sodium, Silica, Hydrogen, Hydroxyl, etc.

As you can see, or not see, water contains particles which can react with other substances that you could use in a manufacturing process.

To deionize water, efficient resins and filters are used, in a both ways: one for positive ions and other for negative ions (cation resin, anion resin). At the end of the deionization process and to test how pure the water is, a electrical current is measured between two poles immersed in the water to be analyzed. If there is no lecture or it is almost null, the water has been purified; in the other hand, if there is an electrical measurement the water needs to be filtered again until there is no electrical current between poles that are immersed.

Of course the final container where this water will be poured must be perfectly clean to avoid any contact with external minerals in the air or inside the container itself. Caution in every step of this process will give a great result, a deionized water that can be used even for human consumption. There is a long history of those who say nothing happens if you drink it, and those who say it is not safe to drink it at all. But let's skip this last thought because is not the subject of this article.

DI Water differs from normal water or distilled water; these would be unusable for some chemistry and biological processes. For the contrary DI Water, because of its the purest one would do fine for the same processes.


And Now? Where can we use it?


There are several uses for this kind of water, most of these uses involves industrial manufacturing and / or items for additive supply. An antifreeze is an additive which lowers the freezing point of a water-based liquid and increases its boiling point. In automotive industry, for instance, DI Water participates in engine’s coolant system, it avoids rust of the cooling system and acts better ethylene glycol, that was developed, and  replaced methanol as an engine cooling system antifreeze. Car batteries as well, uses a great deal of water, and as long as DI Water does not contain any salt or ions, therefore it will prevent the battery discharge.

  • In hobby aquariums as well as aquariums for research, the use of this water reduces the creation of algae and other organisms that normal water facilitates for its generation.
  • Inside of laboratory labor is widely used in the first place, for instrumental cleaning; and, of course, to add to some tests, because this element is inicuos and it will not affect the final result. In the industry and specifically in some machinery, DI Water is used to clean them. Something that regular water will not do efficiently because it contains substances that rust and mineralize parts, axes and joints. But more impressive use is in the press circuits where the remaining substances are cleaned with DI Water; circuits like motherboards, memory cards, net and video components.
  • As well as in car industry, DI Water is used in cooling systems for homes, offices, laboratories and warehouses; it is because of its low conductivity; this means it can stop devices  from overheating and to maintain a certain temperature level on them. Deionized Water is an essential ingredient in hundreds of applications, including medical, laboratory processes, pharmaceuticals, cosmetics, electronics manufacturing, food processing, plating, countless industrial processes, and even the spot-free rinse water at the local car wash. Typically, it serves as an ultra-pure ingredient, a "perfect" cleaning solvent, or as the foundation of a process water recovery/reuse strategy.
  • DI Water is also used in the manufacture of pharmaceutical and nutraceutical products, active pharmaceutical ingredients (APIs) and intermediates, compendial articles, and analytical reagents.
  • In the cosmetics industry DI Water is often used as an ingredient to add purity, stability and performance in many hair care, skin care, body care, baby care, sun care and makeup products, where it is sometimes referred to as "aqua" on product ingredient labels.
  • In the food sector it is used as both an ingredient and a process element in food and beverage processing. As an ingredient, it offers stability, purity and sanitation. As a process element, it is used for sanitation as well.
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