How To Make Deionized Water?

As the demand for pure water rises, deionized water has become a crucial player across diverse industries. This ultrapure form of water is the cornerstone for countless applications, from laboratories to manufacturing plants.

Although making deionized water can add a whole new layer of precision and reliability to experiments, there’s often some confusion around the process and how it works. However, deionized water takes more effort than utilizing an off-the-shelf filter. But no worries, we are here to help.

In this blog post, we’ll take a closer look at the process of making deionized water at home so that you can enjoy clean H2O whenever you need it!

Figure 1 deionization

What Exactly Is Deionized Water?

Deionized water, commonly known as DI water, goes through a purification process that removes mineral ions. This purification process is done through the use of ion-exchange resins or membranes.

The filters take regular water and remove minerals by swapping them with different substances. The filters exchange cations such as sodium, calcium, iron, and copper for anions like chloride and bromide.

The process repeats multiple times to ensure the removal of all mineral ions, leaving the water with a very low level of dissolved solids.

But wait.. what makes deionized water different from distilled water? Do not confuse deionized water with distilled water. Yes, distilled water also removes minerals and impurities from drinking water. But deionization is more effective at removing dissolved solids than Distillation. On the other hand, Distillation relies on evaporation and condensation, which can leave small amounts of contaminants in the water.

Figure 2 distilled water

The Process of Deionization: Techniques and Methods

A DI filtration system is one of the most common ways to remove ions from water at home. This system passes the water through a special bed made of charged resins. These resins attract and trap the salts in the water, which are the substances that give water its electrical charge. As a result, only deionized water can flow through the system.

Ion exchange resins consist of small plastic beads with positive or negative fixed charges. They are exceptionally effective at attracting ions with the opposite charge in water and replacing them with the bead. The outcome is the production of top-quality deionized water.

Figure 3 ion exchange resins


Over time, the resin bed will get filled with ions and won’t work well in removing them anymore. But fortunately, the system can be regenerated by flushing out the resin bed with a concentrated salt water solution. This process removes collected ions from the beads and resets them to an active state to be used again to deionize water. The regeneration process should be performed regularly to maintain effective performance over time.

What Are the Different Types of Deionization?

Although all types of deionization work on the same principle, they serve different purposes. Here are some of the types of deionization.

● Co-current Deionization

In this process, water and a regeneration solution are passed through the ion resin in the same direction. This method is most effective when used for continuous deionization applications.

● Counter-current Deionization

In this method, the water and regeneration chemicals move in opposite directions. This process is better than the co-current deionization method and works well for producing highly purified water.

● Mixed-bed Deionization

The mixed-bed deionization method combines both co-current and counter-current techniques. In this method, the water moves in one direction while the regeneration chemicals move in the opposite direction. This process is extremely effective for removing ions and other impurities from water but is also very costly in time and money.

Figure 4 mixed-bed deionization

● Cutting Edge Technology

While traditional deionization methods involve ion exchange resins or membranes, cutting-edge technologies are revolutionizing how we achieve unparalleled water quality. Some of these technologies include:

1. Electrodeionization System: Reliable and Continuous High-Quality Water

Imagine a water purification system that doesn’t need chemicals and always gives you pure water. That’s exactly what the electrodeionization systems do.

These systems use special membranes and electricity to purify water continuously without needing chemicals. This technology keeps your water pure and impurities-free in electronics or other industries.

2. Ultrapure Water System: Setting New Standards for Purity

In industries like pharmaceuticals and microelectronics, water purity is crucial. That’s where the ultrapure water system steps in. They use advanced techniques like deionization and filtration to achieve the highest purity level.

Every drop of water goes through strict purification processes to remove even the tiniest impurities. With an ultrapure water system, you can meet the strict requirements of industries that demand absolute purity.

3. Reverse Osmosis Systems: Laying the Foundation for Pure Water

The initial and crucial stage of water purification is extremely important, and this is where reverse osmosis systems shine. These systems are excellent for the initial treatment of water, which sets the foundation for further purification processes. By utilizing a special membrane and applying pressure, they effectively eliminate impurities, dissolved solids, and contaminants from water.

Figure 5 reverse osmosis systems

Reverse osmosis is a process that lets water molecules go through while preventing unwanted substances from passing, which makes the water cleaner and safer. Whether you need water for industry or everyday use, you can use RO systems to start with clean, high-quality water.

Enhanced Purity

The combination of technology and product ensures water is exceptionally pure by removing minerals, impurities, and contaminants.

Efficiency and Reliability

The advanced technologies streamline purification, providing a continuous supply of pure water with minimal downtime and maintenance.


By using these technologies, you can maximize product efficiency, reduce operational costs, and optimize resource usage.

Applications and Industries that Benefit from Deionized Water

Deionized water finds its utility across various industries and applications where dissolved minerals, ions, or impurities can severely affect the processes’ performance, quality, and reliability. Let’s explore the advantages of using an industrial deionized water system and how it improves the outcomes.

In Laboratory Settings

The accuracy and reliability of experiments depend on the quality of water used in labs. Regular tap water with minerals and contaminants can affect the results. On the other hand, deionized water is free from minerals and ions, making it great for most experiments. It’s commonly used in sensitive reactions and in preparing substances for techniques like chromatography and electrophoresis.

In Pharmaceutical Manufacturing

Deionized water is widely used in pharmaceutical manufacturing. It helps with tasks like washing, rinsing, and dissolving. When making injectable solutions, it ensures the product is safe and sterile. Deionized water prevents harmful particles and ions from getting into the solution. It’s also useful for making tablets and capsules to ensure they hold together well.

In Electronic Component Cleaning

Deionized water is essential for cleaning electronic components, circuit boards, and semiconductors. Its purity ensures no contaminants or ions are left behind, which could cause problems like short circuits or corrosion. The semiconductor industry specifically needs ultra-pure water for cleaning and etching wafers.

Figure 6 deionized water in electrical company

In Automotive Industries

Apart from these industries, deionized water also has applications in sectors such as automotive. In cars, it’s used as a coolant and radiator fluid to maintain engine efficiency and prevent corrosion.

In Food And Beverage Industry

In the food and beverage industry, it’s important for tasks like ingredient preparation, steam generation, and brewing and bottling. Its purity helps maintain consistent taste, quality, and appearance.

In Power Generation Plants

In power generation plants, deionized water is used for creating steam and cooling the condensers, where even a small presence of impurities could significantly impact the performance and efficiency of the turbines.

In Textile Manufacturing

Deionized water is used in fabric dyeing and finishing in the textile industry. It helps maintain color quality and prevents staining or discoloration.

The Advantages of Deionized Water

Deionized water offers numerous benefits compared to regular tap water. Here are some of its advantages:


Deionized water undergoes a thorough purification process, removing impurities and minerals present in regular tap water. This makes it ideal for use in laboratory and medical environments where purity is critical.

Prevents Corrosion

The absence of ions and impurities in DI water helps prevent the corrosion of machinery and equipment.


Deionized water is often used for cleaning sensitive surfaces such as electronic equipment because it does not leave mineral deposits or residue, which can damage sensitive components.

Boiling Point

Deionized water has a higher boiling point than regular water, which makes it useful in certain industrial applications such as steam generation and as a coolant in nuclear reactors.

Potential Risks and Precautions with Deionized Water

While using deionized water, it’s essential to be aware of potential risks and take necessary precautions:

Loss of Beneficial Minerals

One major concern with deionized water is the removal of not just harmful impurities but also beneficial minerals necessary for human consumption. Excessive consumption of deionized water can lead to nutrient deficiencies.

Figure 7 nutrients in deionized water

Safe Handling and Storage

Ensuring the purity and safety of deionized water requires adhering to safety guidelines and best practices. It is crucial to store deionized water in clean, dry containers free from contaminants. When handling deionized water, gloves, and protective gear are recommended to avoid skin contact and inhalation.

Monitoring and Quality Control

Regular monitoring and quality control measures are necessary to maintain the purity of deionized water. This involves testing for chemical and bacterial contaminants and ensuring the deionization equipment functions properly.

By following safety guidelines and best practices for handling, storage, and maintenance, and regularly monitoring and performing quality control measures, the risks associated with deionized water can be minimized, and its benefits can be safely enjoyed.

Bottom Line

In a nutshell, deionized water is a very pure and flexible type used in many industries and scientific fields. It is created by removing the minerals in regular water using special resins or membranes that exchange ions. This process removes impurities, minerals, and ions, resulting in water that is extremely clean and free from unwanted substances.

With the latest technologies and products, including electro-deionization systems, ultrapure water systems, and reverse osmosis systems, deionized water can be produced with unparalleled purity levels. While using deionized water, it is essential to understand the risks and take necessary precautions, including monitoring and quality control measures, safe handling, and regular maintenance of the equipment.


How to Make Deionized Water from Distilled Water?

To make deionized water from distilled water, you must use a special substance called ion exchange resin. This resin works by exchanging the ions in the water with hydrogen (H+) and hydroxide ions (OH-), thus removing all impurities and leaving you with pure, deionized water.

What is the Cheapest Way to Get Deionized Water?

The cheapest way to get deionized water is by using a distiller. Another cost-effective method is to use deionization kits that are available in the market. These kits come with ion exchange resin, cartridges, and filters to purify water and produce deionized water at home. However, if you require large quantities of deionized water for industrial purposes, it may be more cost-effective to source it from a supplier.

Figure 8 cost effective way to get deionized water

Can I Consume Deionized Water?

Although you can drink deionized water, it is not recommended for regular consumption because it lacks important minerals that benefit human health. Furthermore, deionized water has a low pH imbalance and can cause problems to the human body if consumed excessively.

How Long Can I Store Deionized Water?

In a clean, airtight container, away from sunlight and heat sources, deionized water can be stored for a long time. However, it is important to note that deionized water can absorb impurities from the atmosphere over time, which can affect its purity level. Therefore, using freshly prepared deionized water for critical applications is always best.

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