Chlorine Dioxide Solution: Everything You Need to Know Before Buying CDL

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Chlorine dioxide solution (CDL) has become increasingly popular in recent years, both in industry and among private individuals. But what exactly is CDL? And why should you buy it?

What is Chlorine Dioxide Solution (CDL) ?

Chlorine dioxide solution, also known as CDL, is an aqueous solution that contains chlorine dioxide (ClO2). Chlorine dioxide itself is a yellow to reddish gas that can be liquefied as a yellow liquid at room temperature. It is known as a strong oxidizing agent and has disinfectant properties . CDL is available in different concentrations depending on their intended use. CDL is often used in water treatment .

Why buy CDL?

Chlorine dioxide has a number of benefits :

  1. Efficient Bacteria Killing: CDL can efficiently kill a wide range of bacteria, viruses and other microorganisms.
  2. Environmentally friendly: Unlike chlorine, chlorine dioxide leaves no harmful residues.
  3. Versatility: Chlorine dioxide solutions are used both in water treatment and for surface disinfection.
  4. Clean Drinking Water: CDL's ability to purify water highlights the essential need for clean drinking water for health. In many parts of the world where clean drinking water is not a given, CDL offers an efficient and cost-effective solution.

What should you pay attention to when buying CDL?

  • Purity: Look for products without impurities.
  • Concentration: Depending on the intended use, a different CDL concentration may be required.
  • Storage: CDL should be stored in a cool, dark place.
  • Freshness: Freshness is crucial, especially with ready-made solutions. A freshly prepared product is usually more effective.

How is CDL made?

The production of chlorine dioxide solution (CDL) can be done by various methods. Here are the most common methods and their differences:

  • Chemical reaction: This is the most commonly used method. Sodium chlorite is mixed with an acid, often hydrochloric acid or citric acid. The reaction produces chlorine dioxide, which is then dissolved in water. This method is relatively simple and cost effective, but can result in different concentrations depending on the ratios and conditions used.
  • Oxidation: This process involves mixing sodium chlorite with an oxidizing agent. This method can result in higher purity of the chlorine dioxide produced because fewer byproducts are formed. However, it is technically more demanding and usually more expensive than the chemical reaction.
  • Distillation: This involves distilling chlorine dioxide from a solution and then dissolving it in water. This process can ensure high purity and concentration of chlorine dioxide. However, it is also the most complex and costly procedure.

Regardless of the preparation method, it is important to check the final concentration and purity of the solution to ensure its effectiveness and safety.

Shelf life of chlorine dioxide solutions

The shelf life of CDL varies depending on concentration and storage conditions. A 0.3% chlorine dioxide solution that is stored optimally - that is, cool, dark and in a well-sealed container - can last up to 6 months . After that it starts to lose its effectiveness .

For longer durability and maximum effectiveness , 2-component sets could be considered. With these, chlorine dioxide is only activated when necessary through oxidation by mixing a liquid with a powder.


Chlorine dioxide solution is an effective and versatile disinfectant. If you want to buy CDL, you should do your research and choose the most suitable product for your needs .

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