Difference Between Deionized and Distilled Water

Edited by Diffzy | Updated on: April 30, 2023


Difference Between Deionized and Distilled Water

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Both deionized and distilled water are exceedingly pure water. However, they are made in two different ways. Distilled water may be purer than deionized water, depending on the source water, but this does not always imply superior. There are advantages and disadvantages to using deionized water over distilled water for specific procedures regarding cost and efficiency. First, it would be best to comprehend the differences between distilled and deionized water before deciding on the most acceptable option. Deionized water (di) has had all ions removed, meaning all dissolved mineral salts. Most contaminants are removed from distilled water by boiling it until it evaporates and then condenses.

One of the oldest methods for producing pure water is distillation. Filtered water is heated until it evaporates and steamed. This is collected in a sterile container and condenses, and returns to its original state as water. When water turns into steam, most pollutants (including minerals) are left behind since water has a lower boiling point than they do. As a result, the water produced is exceptionally pure. Some water is also double- or triple-distilled, with the condensed water boiled and condensed a second or third time.

The most prevalent contaminants detected in water are organic molecules and inorganic minerals. Filtering technologies such as physical filters, carbon filters, and reverse osmosis (RO) membranes may often remove organics. The water is then passed through a di system containing two resin types: cation and anion. These resins attract positive and negative ions, replacing them with h+ and oh-. Water is formed when h+ and oh- mix to form h2o. Nearly all pollutants may be removed using filters and di resins.

Distilled Water Vs Deionized Water

Demineralized water has had the majority of its mineral and salt ions removed. Demineralized water is also called deionized water or demi-water. Demineralized water differs from distilled water in several ways. By boiling and condensing distilled water, it's purified.

The main difference between demineralized and distilled water is that distilled water usually contains fewer organic pollutants, whereas Deionization does not eliminate uncharged molecules like viruses or bacteria. The amount of mineral ions in demineralized water varies depending on the production method. Deionization produces cleaner water and leaves more miniature scale in the installations where it is utilized. The material of your instruments should be considered when using this demineralized water. Not all materials are suitable for use as demi-water piping; this depends on the temperatures employed.

Difference Between Distilled Water and Deionized Water in Tabular Form

Parameters of comparison Deionized water Distilled water
Definition It’s a type of pure water that has dissolved ions removed. It has purified contaminants by boiling them, allowing them to condense in various locations.
Change of phase No change Liquid – gaseous – liquid
Purity level 90-99% 99.9%
Conductivity Low conductivity High conductivity
History Used only the past 100 years. Used since antiquity
Mixture It involves a mixture of water and charged resin. No addition of extra chemicals is required in the process.
Making process Ion exchange method, RO method Vaporization and recondensation

Deionized Water And Distilled Water Have Certain Similarities.

Both distilled and deionized water is pure water with the heavier contaminants removed. They are also often more expensive than unpurified water, and they provide functions that unpurified water does not.

What is Deionized Water?

Water that has had most of its ions removed is deionized water or di water. Calcium and sodium ions, for example, can easily be absorbed by the soil. Water pipes collect the ions such as iron and copper. Ions are naturally occurring water components that are removed by filtering.

How does deionized water become made?

Multiple ways exist for deionizing water. We employ the following deionization-based purification technologies:

  • Ionization by electrolysis

Edi is a water treatment method that removes ions and other ionized species from water, such as salts and organic acids, using electricity, ion exchange membranes, and resin. Ion resin is used to fill the chambers separated by ion-exchange membranes. An electric current pushes the ions through the membranes and resin, purifying the water when water passes.

  • Exchange of ions

Water is transported across beds of ion-exchange beads during the deionization process. These ions are transferred from the water to the beads when they contact them. Hydrogen and hydroxyl ions then replace them in the water. This results in pure water as the final product.

  • Reverse osmosis for Deionization

After using reverse osmosis, water can be deionized (ro). To remove contaminants from water, it is passed through a semi-permeable membrane. Ions, organic molecules, and particles all fall into this category. After the ro procedure, the water is already clean. When you combine it with Deionization, you get exceptionally pure water.

What is the purpose of deionized water?

Because of its high purity, deionized water is valuable. Ions often have an electric charge. This charge is removed when water is deionized. As a result, it is employed in various sectors and for various purposes.

  • Biochemistry in medicine

When it comes to biochemistry, ions in water can cause various problems. As a result, the findings and immunoassays are less reliable. Using di water avoids this difficulty in clinical biochemistry and ensures correct data.

  • Electrochemistry

Deionized water is utilized in electrochemistry because of its low conductivity. This eliminates signal interference from ions in the water. Ions in the feed water can interact with ions utilized during an application, changing electrical characteristics and affecting results.

  • Immunochemistry

Maintaining constant ph equilibrium is crucial in immunochemistry. Ions can disrupt the ph balance, and metal ions can affect processes cheval. This can be avoided by using deionized water.

  • Biology molecules

For molecular biology, deionized water is the ideal solution. Negatively charged molecules imitate the charge of DNA, causing the catalytic process to be disrupted. Ions can influence overall concentration levels in electrophoresis. The ph equilibrium and ionic strength utilized as buffers are disrupted.

  • Spectrophotometry

Spectrophotometry is a technique for determining the amount of a material present by measuring the amount of light absorbed by a solution. Because ions absorb light, the results will be skewed. This interference can be avoided by using deionized water in specific applications.


You gain an advantage by using di water in your applications. This is due to the following:

  • is entirely free of impurities.
  • Ions have been removed, resulting in reduced conductivity.
  • does not react with metals and is non-corrosive.
  • dilutes the solution without polluting it.
  • It is simple to make.


For industrial and scientific uses, demineralized water is employed. Consider these examples:

  1. Testing and lab applications
  2. Carwash
  3. Water for the production of computer chips
  4. Lead-acid batteries and cooling systems are examples of automotive applications.
  5. feed for a boiler
  6. Cutting via laser
  7. Fuel cell optimization
  8. Applications involving steam irons and steam raising
  9. Production of pharmaceuticals
  10. Cosmetics
  11. Aquariums
  12. Extinguishers are devices that are used to put out the fire.

Health Dangers

One would believe that demineralized water, which has been filtered of minerals via ion exchange, distillation, membrane filtering, or other processes, could be utilized as the drinking water. As with anything, there are many benefits and drawbacks to drinking demineralized water. The benefit is that the minerals harmful to our health have been removed. There is a lot of evidence about the adverse effects of specific minerals on our bodies. Drinking demineralized water has the downside of removing good minerals from our bodies, causing a deficiency that our health system cannot work effectively. In the end, demi-water should not be utilized as a source of drinking water since it removes minerals necessary for optimum health.

What Exactly Is Distilled Water?

It is steam that has been restored to a liquid state from a boiling state. Distilled water is the purest water available. Minerals, germs, pesticides, and other contaminants are present in any water, whether from a natural spring, an artesian well, or a conventional tap. Distillation removes all contaminants from water. It also eliminates 99.9% of the minerals that are dissolved in water. A type of purified water is distilled. 

Is It Safe to Drink Distilled Water?

It's safe to drink distilled water. However, one will most likely find it flat or tasteless. This is due to removing critical minerals such as calcium, salt, and magnesium, which give tap water its distinct flavour. There is nothing left save hydrogen and oxygen. Distilled water has a variety of applications.

The following are examples of typical applications:

  • Instruments and processes used in medicine are used in hospitals to disinfect equipment and help prevent infection. Filtering waste from the blood using kidney dialysis devices uses ultra-pure water.
  • Tests in a lab Nothing in distilled water interacts with scientific studies or affects their precision.
  • It's virtually always distilled water in moisturizers, deodorants, and shampoos.
  •  Distilled water doesn't corrode metal engine parts or interfere with batteries because it lacks minerals.
  • You may choose to use distilled water at home for cooking and various other purposes.
  • If your baby's immunity is poor, mix it with newborn formula. Tap water is fine for everything else.
  •  Hair can be dulled by fluoride, chlorine, and other compounds in shower water.

Distilled Water Has Risks

Even electrolytes such as potassium and other minerals that your body requires are absent from distilled water. If one drinks distilled water, one may be missing out on some of these micronutrients. There's a link between low-calcium, low-magnesium water and fatigue, muscle cramps, weakness, and heart disease. Furthermore, distilled water may not keep you hydrated as effectively as other various types of water.

Deionized Water Vs Distilled Water Costs

When ultra-pure water (double or triple distilled) isn't needed, many consumers compare the costs of deionized and distilled water. When vast amounts of water need to be boiled, cooled, and collected, the distillation process might take longer. This technique also necessitates fuel to heat the water and store the water in a sterile container. Deionized water is distilled water that has been exposed to the air for some time.

On the other hand, Deionization can be done fast, mainly if a mixed bed resin is used and the water only has to pass through once. Many deionized water systems require two mixed bed cartridges or tanks to verify that all ions have been removed, but it's still a faster procedure than distillation. Furthermore, because Deionization is a chemical process, energy is typically required to monitor the operation and transport of the water. If the DI resin is regenerated on-site, the process will take longer and cost more.

Key Differences Between Distilled Water and Deionized Water in Points

  1. Distilled water is pure than deionized water because it removes all contaminants and pathogens regardless of the charged ions present. In contrast, deionized water only removes charged particles, unlike uncharged particles like viruses.
  2. Water that has been deionized does not conduct electricity, whereas distilled water does.
  3. Because deionized water is corrosive and distilled water is not, it is used in the metal-working industry.
  4. Distilled water can be made by simply boiling and condensing the water, but deionized water is made using the RO method, similar to the Ion-Exchange method.
  5. Distilled water is produced via a phase shift, but a phase shift does not produce deionized water.
  6. Distilled water has been used for centuries, while deionized water has only been utilized for a hundred years.


There are advantages and drawbacks to both forms of water. Both Deionization and distillation provide exceptionally pure water for specific uses. Nonetheless, they are not the same. Deionized water does not remove impurities such as organic molecules, bacteria, or viruses, whereas distilled water does. Similarly, distilled water necessitates a phase transition from vapour to liquid, but not a chemical mixture, whereas deionized water necessitates a chemical mixture but not a condition change.

On the other side, distilled water can disrupt an ecosystem by restoring the mineral proportion to which the local environment has adapted. Multiple deionization processes produce deionized water, such as counter-current and mixed-bed Deionization. Counter-current is the least expensive method, but mixed-bed provides the most transparent water.

 Deionized water should not be consumed, even if it is distilled. Deionized water is slightly acidic and, in addition to not supplying materials, can injure dental enamel and sensitive tissues. You can drink the water once exposed to air for a bit. Deionized, distilled water


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"Difference Between Deionized and Distilled Water." Diffzy.com, 2024. Mon. 17 Jun. 2024. <https://www.diffzy.com/article/difference-between-deionized-and-distilled-water-281>.

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