Deionization Systems

In natural area all water contains dissolved mineral salts. In many areas of the industry (steam power plants, pharmaceutical industry, etc.)
there is a need to provide higher purity (1 microsiemens/cm less). For this purpose, known as deionization, the process of detoxification of salt ions dissolved in water is to be done.

Deionization (DI) is a water filtration process whereby total dissolved solids (TDS) are removed from water through ion exchange.The process of deionization uses two resins that are opposite in charges – the cationic (negative) and the anionic (positive). The cationic resin is typically made from styrene containing negatively charged sulfonic acid groups, and will be pre-charged with hydrogen ions. This resin will attract the positively charged ions in the water (Ca++, Mg++, Na+, etc.) and releases an equivalent amount of hydrogen (H+) ions.

As with many other types of filtration or purification processes, a single deionization cycle may not remove all the TDS. Some of the ions will not be attracted by the resins, so running the DI water through a second cycle will provide for additional purification. In other words, the more you run the deionized water through the more pure the yielding water will be.