Functioning and advantages of dechloramination

Destruction of chloramines in collective spas and swimming pools

Elimination of chloramines: health and ideal bathing comfort

BIO-UV Low pressure and Medium pressure technologies, approved by the Ministry of Health, guarantee that you benefit from the lowest running costs on the market.

In most countries, chlorine is still the mandatory disinfectant product. However it generates chloramines (mono, di and trichloramines) which are harmful for both bathers and personnel.
The UV medium pressure technology makes it possible to reduce the 3 types of chloramines and trihalomethanes.

In order to solve this issue using an appropriate UV-C swimming pool treatment, BIO-UV has been developing and patenting specific ranges for dechloramination of collective spas and swimming pools (use of chloramine removers) since 2003.

The BIO-UV swimming pool and spa water treatment represents an ideal alternative for operators of facilities open to the public. Chloramine removers are now being used in many such establishments.

BIO-UV is a technical partner of the French Swimming Federation


Why combat chloramines?

Chlorine attacks the organic matter in water, decomposes and then creates chloramines.

When water contains a high level of chloramines: 

  • They irritate bathers' eyes, skin and mucous membranes
  • The smell of chlorine becomes strong and cause respiratory infections (which is "reassuring" but does not necessarily mean that the water is disinfected and acting as a disinfectant)
  • Water renewal increases significantly in order to lower the level of chloramines

It is mandatory to treat water in collective swimming pools and spas. This treatment is even governed by strict standards (water quality, water purification, use of swimming pool products, etc.).  
Chloramine removers meet all these standards.

Dechloramination: for which applications?

In November 2004, BIO-UV obtained approval by the French Ministry of Health and Social Protection for UV disinfection and dechloramination of collective swimming pools and spas (chloramine removers).

BIO-UV water treatment devices remove chloramines and disinfect:

  • public swimming pools
  • collective spas
  • thalassotherapy pools treated using chlorine
  • spa facility swimming pools treated using chlorine (usually a swimming pool product is used)
  • fitness centre pools
  • aqua biking pools
  • camp-site swimming pools
  • hotel swimming pools, etc.

The operators of collective facilities (swimming pools, spas, etc.) are faced with problems of cost and regulations as part of their occupation.  Indeed, treatment of swimming pool (or spa) water is governed by precise standards. 

The BIO-UV UV-C disinfection process integrates perfectly into these regulations and guarantees that water treatment is appropriate for each basin. Chloramine removers are perfectly suitable.


How the dechloramination device works

The water will be disinfected by means of the UV-C water treatment lamps. The BIO-UV reactors, also known as chloramine removers, adapt to the filtering flow rate of the swimming pool or spa. The UV-C disinfection device is installed after the water filter, on the discharges.

Each time the water goes through the UV-C treatment device for swimming pools, it is submitted to radiation from the lamps and exits the device completely disinfected. The combined chlorine level is also reduced significantly: this is known as dechloramination or chloramine removal.
The water disinfected by passing through the reactor (chloramine remover) is then returned to the basin.

In early 2009, BIO-UV started equipping its range of chloramine removers in public swimming pools and spas with power regulators according to the UV intensity or the level of chloramines.

The advantages of the BIO-UV chloramine removal devices are:

  • Medium pressure is recognised worldwide as being the most effective technology on mono-, di- and trichloramines
  • UV-C disinfection is very effective and safe thanks to the use of UV-C swimming pool (or spa) lamps
  • 50 to 75% reduction in the level of combined chlorine to reach an average level of 0.1 to 0.3 ppm
  • Compatible with all types of filtering
  • Reduction of corrosion
  • Lowering of the quantity of water to renew: saving of up to 60 %, depending on the pool
  • Optimisation of heating and dehumidification costs
  • Improvement of ambient air quality for bathers and personnel, beneficial for their health
  • Improvement of bathing quality thanks to elimination of eye and mucous membrane irritation
  • Better environmental protection
  • Improved image for the amenity
  • Installation amortised within 6 to 24 months
  • Quick and easy installation, simple maintenance
  • Lower operating costs

BIO-UV guarantees the use of UV-C water treatment lamps at a dose of 60 mJ/cm², even at the end of a lamp's operating life. It avoids the risk of contamination by Cryptosporidium, Giardias and the Toxoplasmas present in surface water. Water quality is maintained.

Magazine L’Eau L’Industrie Les Nuisances, n°311, 2008

  1. "Toxoplasma oocysts seem enough resistant against ozonation conditions such as those commonly used. As a comparison, cryptosporidia and giardia are not very sensitive to ozonation too. Increase delay or concentration during  ozonation process could help to inactivate toxoplasma oocysts but this is not very realistic in production because this operation would create harmful by-products such as bromates.
  2. " In vivo and in vitro achieved results show UV efficiency to inactivate toxoplasma oocysts. Toxoplasma inactivation through UVs is the same as the one explained for other parasites (Cryptosporidium and Giardia) (Hijnen et al., 2006). UV treatment is in fact a solution which is often installed in drinking water treatment plants, in order to reduce the occurance risk of unwished events with a microbiological origin."
  3. "Cryptosporidium oocysts and Giardia cysts are much resistant against chemical processes of disinfection and particularly against chlorine and ozone.

The Wall Street Journal, 30 July 2008

  • "Crypto isn't affected by chlorine (except at levels unsafe for humans)"
  • "Now, many water parks are installing ultraviolet systems, which kill parasites including crypto when water passes through the systems black light."

The French Ministry of Health Services, CSHPF, Water Division, 01 February 2005

  • « considers that ultraviolet (UV) rays, applied with a minimum insolation dosis of 40 mJ/cm2, offer a sufficient biocidal effect against Cryptosporidium », 2008

  • Chlorination water isn't enough anymore
  • "UV are installed … it is an instant kill. It breaks the protein coat around the crypto and it's killed instantly".
Discover our solutions
BIO-UV Medium pressure range
BIO-UV Medium pressure range

Bolstered by its technological lead, the BIO-UV group was the first and the sole company to be approved by the Ministry of Health for the medium pressure dechloramination since 2004 and for the low pressure dechloramination since 2013.

BIO-UV Low pressure range
BIO-UV Low pressure range

Bolstered by its technological lead, the BIO-UV group was the first and the sole company to be approved by the Ministry of Health for the medium pressure dechloramination since 2004 and for the low pressure dechloramination since 2013.