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Chloramines in public and commercial swimming pools

The problem of chloramines in public and collective swimming pools is a recurring subject.
But what is it really about and how to treat chloramines?

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What is chloramine?

It is created by the reaction of chlorine when it acts as a disinfectant on the organic matter brought by the bathers (sweat, cream, saliva, urine).

“Inorganic chloramines, therefore without organic radicals, are derived from the reaction of chlorine (in the form of hypochlorous acid HOCl) with ammonia (NH3). Examples include monochloramine (NH2Cl), dichloramine (NHCl2) and trichloramine (NCl3). “

Why should we treat them?

Regulations require that its value does not exceed 0.6 ppm in water

It is necessary to treat chloramines in water:

  • In order to avoid overflows caused by additional water supply.
  • In addition, too many chloramines in the water can generate trichloramine in the air and can be a potential health hazard for bathers and employees. The management of trichloramine will also require additional air treatment and thus additional costs. Solutions are available for the measurement of trichloramine in air.

How to decrease or remove chloramines?


The pH of the water should be maintained between 7.2 and 7.4.

Les strippings

It is also recommended to carry out strippings at the level of the buffer tanks (waterfall with large air intake) in order to transfer the chloramines from the water into the air and evacuate them by suction.

The Hygiene rules

There are also simple hygiene rules that can significantly reduce the level of chloramines. The main ones are:

  • Take a soapy shower before swimming to remove sweat and sunscreen residue from the skin and to reduce the amount of organic matter brought into the pool by bathers,
  • Remove makeup before swimming,
  • Encourage children to go to the bathroom before swimming.

Water supply

Water renewal reduces chloramines but incurs additional operating costs.

Other treatments

UV, ozone

How to measure chloramines?

Chloramines or combined chlorine are calculated as follows:


For this purpose, SYCLOPE offers a range of controllers that calculate the chloramine in swimming pool water:

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Do you have any questions? Need a diagnosis, recommendations? Need a documentation, an estimate ? The SYCLOPE team is at your disposal …

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