Chlorine used to disinfect indoor swimming pools could be behind the surge in childhood asthma, researchers say.

A new study found regular swimming in indoor pools was linked to a destruction of the cell barriers that protect the deep lungs.

Forum Response: British Swimming Pools Federation

Allen Brobyn, chief executive for the British Swimming Pools Federation, told ePolitix.com: "The British Swimming Pool Federation (BSPF) believes that reasons for increases in child asthma are more complex than reports of recent Belgian research suggest, and links with chlorine in swimming pools are far from proved.

"Chlorine levels in public pools in this country have reduced due to technical improvement by the industry and better management.

"Chlorine remains the best-proved and most effective disinfectant for swimming pools, although there is now a variety of other methods available.

"Most of these however require a minimum residual level of chlorine for effective disinfection.

"The most important factor in reducing trichloramine levels is a wider understanding of the importance of bather hygiene

"Correct design of water treatment and air handling systems in indoor public swimming pools is critical.

"Many outdated pools need urgent investment to upgrade these facilities and give our children better, safer surroundings."