| Water deionization is a treatment process involving | | | | Maintaining deionizing equipment can be expensive for |
| removal of minerals in water and so it is also called | | | | companies because the resin beds require regular |
| demineralization. It is achieved by passing feed water | | | | regeneration as part of maintenance process. This is |
| through ion exchange resins. The result is ultra pure | | | | because the resins collect impurity from feed water. |
| water, but water quality largely depends on the | | | | Bacteria may also collect and thrive in resins and |
| process and the equipment used. Nonetheless, it is an | | | | cause spoiling. Thus, their sterilization is another |
| important constituent of many industrial processes. | | | | important aspect. |
| Cosmetics and pharmaceutical companies purchase | | | | The manner of deionization is even more important in |
| pure water in bulk quantities. Some companies | | | | pharmaceutical industry because it demands liquid that |
| actually have their own treatment facility but this is | | | | is not only devoid of ions but also devoid of organics. |
| going to add much to the cost of operations. DI | | | | For industrial applications, DI water testing is carried |
| water is used to make cosmetic products and | | | | out only through conductivity and resistivity tests, |
| medicines because it does not affect the chemical | | | | which indicate the presence of salts but not the |
| nature of substances. Plain water contains minute | | | | presence of non-ionic substances and impurities. |
| quantities of substances, such as chlorine, sulphates, | | | | Affiliating with water companies is often important |
| and various metal ions. | | | | for many companies. Transportation and shipment of |
| In industrial and manufacturing plants, deionized water | | | | pure water generally do not involve chemical safety |
| in bulk is also used in various key processes. This | | | | precautions. Manufacturers use PVC plastics as |
| type of liquid is important primarily as a cleaning | | | | containers. According to some experts the material |
| agent. Many aqueous cleaners are made of | | | | containers are made of must be checked for |
| surfactants and a large percentage of pure water. | | | | compatibility with demineralized water because it can |
| Some cleaning agents just contain DI water. Pure | | | | corrode some materials. But this inherent |
| water is used in cleaning windows, glassware, | | | | corrosiveness is not backed up by evidence but |
| equipment, instruments, utensils, and even large | | | | remains a speculation. |
| storage tanks primarily because it does not cause | | | | Deionized water is also used in automotive industry. |
| scaling. Spot-free cleaning can only be achieved with | | | | Car wash shops use this type of liquid during the last |
| the use of liquid devoid of ions because plain water | | | | rinsing because it does effectively remove foam, |
| can leave mineral deposits on surfaces that make | | | | cleaning solution, and dirt from car windows and |
| cleaning inefficient. Usually, DI water is important | | | | surfaces. Car lead-acid batteries also need deionized |
| during the rinsing process, when high pressure jets of | | | | or distilled water after charging when their water |
| water are employed for thorough rinsing. | | | | level drops below normal. |