Which Form of Chlorine is Good for Swimming Pool Treatment?

Although technology has evolved much more almost in every field of life. So, it is in the swimming pool industry. But there is still a need to know much about it. Sanitizing is the most important factor when it comes to swimming pool treatment as it prevents us from germs.

To take care of all these kinds of infectious diseases, in order to prevent swimmers. There is a need for using some disinfecting agents. The most commonly used disinfectant for swimming pools is TCCA, which chlorine. In this article we will see that which form of chlorine is good for swimming pool treatment.

Five basic types of chlorine are discussed in this article. Which are commonly used in swimming pools? Such as:

  • Chlorine Gas (Cl2)
  • Bleach (NaOCl)
  • Calcium Hypochlorite (Ca (OCl)2)
  • Trichloro-isocyanuric Acid
  • Sodium Dichloroisocyanurate (ditto)

Apart from these few others also exist. Let us further see which form suits best for swimming pool treatment. An important thing to keep in mind here is that all types of chlorine work the same when dissolved in water i.e. hypochlorous acid or a combination of chlorine and cyanuric acid. But they differ in appearances to some extent.

Among all Calcium Hypochlorite- Cal Hypo (solid), Sodium Hypochlorite- Bleach (liquid) and Lithium Hypochlorite- Lithium Hypo are considered to be some of the best forms of chlorine good for swimming pool. Let us discuss them in detail.

1.          Calcium Hypochlorite- Cal Hypo (solid)

When the compound is added into the water. The chlorine in it reacts with water to form some chemicals such as hypochlorous acid. This hypochlorous acid kills bacteria and other germs. It is strongly alkaline. It acts as a great pool sanitizer and provides the benefits of calcium to the water.

Hypochlorous acid is used which is good sanitizer. But there is one problem with hypochlorous acid. It is not much stable. It can break down when exposed to UV rays from the sun and can also combine with other chemicals to form new compounds.

So, there is a need to use some sort of stabilizing agent. One of the most stabilized agents used for pool chlorinators is cyanuric acid. It is more stable compound when reacts with chlorine. It also does not break down easily when composed of UV radiation from the sun.

2.          Sodium Hypochlorite- Bleach (liquid)

Now let us discuss in detail about sodium hypochlorite, liquid chlorine also known as bleach. It is extremely alkaline in nature with a pH level of 13.0. Liquid chlorine or simply bleach is easy to measure and affordable. It is also a good sanitizer for pool treatment. It can be used for both residential and commercial pools.

Also, it is easily available in the pool market. It is also great to use because it is an automated chemical feeder. You can buy it at a low cost which is also a plus point for liquid chlorine.

But alongside it also has some of the drawbacks as well. It may get worse in some weeks and when exposed to direct sunlight it may worsen in days. In order to prevent this, it is necessary to use some sort of stabilizers such as cyanuric acid as discussed earlier as well. If you want to increase the lifetime of chlorine  

One more drawback of using liquid chlorine is that it has a high pH value. The higher pH level of chlorine is less effective. The lower the pH value the more effective is chlorine’s killing speed. So, it is advised to use a lower pH value.

3.          Lithium Hypochlorite- Lithium Hypo

Now let us have a look at lithium hypochlorite. It is considered to be the more stable form of chlorine. As it provides a longer shelf life as compared to Cal Hypo or Bleach. It helps to boost the alkalinity of water when dissolved in water and also raises the pH value.

Along with that, it has some cons as well. Like it cannot be found easily as it is not so common. It also has a high cost and low strength. It is also regarded as an insufficient pool sanitizer for a busy commercial pool.


In this article, it is explained in detail some of the best forms of chlorine which are good for swimming pool treatment. Some basic types of chlorine such as chlorine gas, liquid chlorine, calcium chlorine, and some others are explained in detail. Which when dissolved in water almost works the same.

But it is advised to use more of a stabilized form of chlorine that will benefit water for a long time. Cyanuric acid is one of the most stable forms of chlorine to be used. As it does not break down easily when exposed to UV light. So, using a combination of cyanuric and chlorine can be a good option for swimming pool treatment.

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