{"id":222,"date":"2026-08-27T23:54:07","date_gmt":"2026-08-27T15:54:07","guid":{"rendered":"http:\/\/www.bingolkresmelegim.com\/blog\/?p=222"},"modified":"2026-08-27T23:54:07","modified_gmt":"2026-08-27T15:54:07","slug":"how-to-remove-chlorine-from-water-for-an-edi-pure-water-system-4a4a-fcb8c0","status":"publish","type":"post","link":"http:\/\/www.bingolkresmelegim.com\/blog\/2026\/08\/27\/how-to-remove-chlorine-from-water-for-an-edi-pure-water-system-4a4a-fcb8c0\/","title":{"rendered":"How to remove chlorine from water for an EDI Pure Water System?"},"content":{"rendered":"

As a provider of EDI (Electrodeionization) Pure Water Systems, I often encounter customers who are concerned about the presence of chlorine in water and its impact on the system’s performance. Chlorine is commonly used as a disinfectant in municipal water supplies, but it can have detrimental effects on the components of an EDI system, such as ion – exchange resins and membranes. Therefore, removing chlorine from water is a crucial step in ensuring the long – term efficiency and reliability of an EDI Pure Water System. In this blog, I will share some effective methods for chlorine removal. EDI Pure Water System<\/a><\/p>\n

<\/p>\n

Understanding the Impact of Chlorine on EDI Systems<\/h3>\n

Before delving into the removal methods, it’s important to understand why chlorine is a problem for EDI systems. Chlorine is a strong oxidizing agent. When it comes in contact with the ion – exchange resins in an EDI system, it can oxidize the functional groups on the resin beads. This oxidation leads to a loss of the resin’s ion – exchange capacity, reducing the system’s ability to remove ions from water and produce high – purity water.<\/p>\n

Moreover, chlorine can damage the semi – permeable membranes in the EDI stack. The membranes are responsible for separating the different compartments in the EDI cell and allowing the selective passage of ions. Chlorine can cause the membranes to become brittle and develop pinholes, which can lead to cross – contamination between compartments and a significant decrease in water quality.<\/p>\n

Methods for Chlorine Removal<\/h3>\n

Activated Carbon Filtration<\/h4>\n

One of the most common and effective methods for removing chlorine from water is through activated carbon filtration. Activated carbon has a large surface area with numerous pores, which provides a high adsorption capacity for chlorine and other organic compounds.<\/p>\n

When water passes through an activated carbon filter, chlorine molecules are attracted to the surface of the carbon and undergo a chemical reaction. The chlorine is reduced to chloride ions, which are much less harmful to the EDI system. The activated carbon also removes other contaminants such as volatile organic compounds (VOCs), which can also affect the performance of the EDI system.<\/p>\n

There are two main types of activated carbon filters: granular activated carbon (GAC) and block activated carbon. GAC filters are made up of small granules of carbon, which provide a large surface area for adsorption. Block activated carbon filters, on the other hand, are more compact and can provide a more uniform flow of water through the carbon.<\/p>\n

The effectiveness of an activated carbon filter depends on several factors, including the contact time between the water and the carbon, the quality of the carbon, and the flow rate of the water. It is important to choose a high – quality activated carbon filter and to ensure that the water flow rate is within the recommended range for the filter.<\/p>\n

Chemical Reduction<\/h4>\n

Another method for removing chlorine from water is through chemical reduction. This involves adding a reducing agent to the water to react with the chlorine and convert it into a less harmful form.<\/p>\n

One of the most commonly used reducing agents is sodium bisulfite (NaHSO\u2083). When sodium bisulfite is added to water containing chlorine, it reacts with the chlorine to form sodium sulfate (Na\u2082SO\u2084) and hydrochloric acid (HCl). The reaction can be represented by the following equation:<\/p>\n

(NaHSO_{3}+HClO = NaHSO_{4}+HCl)<\/p>\n

The advantage of using chemical reduction is that it can be very effective in removing chlorine quickly, even at high concentrations. However, there are some drawbacks. The addition of chemicals can increase the salt content of the water, which may require additional treatment steps downstream to remove the excess salts. Also, it is important to carefully control the dosage of the reducing agent to avoid under – or over – treatment.<\/p>\n

Ultraviolet (UV) Dechlorination<\/h4>\n

Ultraviolet light can also be used to remove chlorine from water. UV light has a specific wavelength that can break the chemical bonds in chlorine molecules. When water containing chlorine is exposed to UV light, the chlorine is decomposed into chloride ions and other by – products.<\/p>\n

The main advantage of UV dechlorination is that it is a chemical – free process, which means that it does not add any additional chemicals to the water. This is particularly beneficial for applications where the presence of additional chemicals is not desirable, such as in the pharmaceutical or food and beverage industries.<\/p>\n

However, UV dechlorination has some limitations. It is less effective at high chlorine concentrations, and it requires a relatively long exposure time to achieve complete dechlorination. Also, the UV lamps need to be replaced regularly to maintain their effectiveness.<\/p>\n

Choosing the Right Chlorine Removal Method<\/h3>\n

When choosing a method for removing chlorine from water for an EDI Pure Water System, several factors need to be considered.<\/p>\n

The first factor is the chlorine concentration in the feed water. If the chlorine concentration is relatively low (less than 1 ppm), activated carbon filtration may be sufficient. However, if the chlorine concentration is high, chemical reduction or a combination of methods may be required.<\/p>\n

The second factor is the quality requirements of the final product water. If the water needs to be of very high purity and free of any additional chemicals, UV dechlorination may be the best choice. On the other hand, if the presence of a small amount of additional salts is acceptable, chemical reduction can be a cost – effective option.<\/p>\n

The third factor is the flow rate of the water. Different methods have different flow rate limitations. For example, activated carbon filters may have a maximum flow rate beyond which the contact time between the water and the carbon is too short for effective chlorine removal.<\/p>\n

Maintenance and Monitoring of Chlorine Removal Systems<\/h3>\n

Once a chlorine removal system is installed, it is important to maintain and monitor it regularly to ensure its continued effectiveness.<\/p>\n

For activated carbon filters, the carbon needs to be replaced periodically. The replacement frequency depends on the chlorine concentration in the feed water, the flow rate, and the type of carbon. A pressure gauge can be installed on the filter to monitor the pressure drop across the filter. An increase in pressure drop may indicate that the carbon is becoming clogged and needs to be replaced.<\/p>\n

In the case of chemical reduction systems, the dosage of the reducing agent needs to be adjusted regularly based on the chlorine concentration in the feed water. A chlorine analyzer can be used to measure the chlorine concentration in the water before and after the treatment process to ensure that the chlorine is being effectively removed.<\/p>\n

For UV dechlorination systems, the UV lamps need to be checked regularly for their intensity. A UV intensity meter can be used to measure the output of the lamps. If the intensity falls below a certain level, the lamps need to be replaced.<\/p>\n

Conclusion<\/h3>\n

<\/p>\n

Removing chlorine from water is an essential step in ensuring the proper functioning and longevity of an EDI Pure Water System. By understanding the impact of chlorine on the system and choosing the right removal method, you can effectively protect your EDI system and produce high – quality pure water.<\/p>\n

DI Water System<\/a> If you are in the process of setting up an EDI Pure Water System or need to improve the performance of your existing system, I encourage you to reach out to us. Our team of experts can provide you with customized solutions based on your specific requirements and water quality conditions. We are committed to providing high – quality products and excellent customer service. Contact us to discuss your needs and start the journey towards a more efficient and reliable EDI Pure Water System.<\/p>\n

References<\/h3>\n