A new study has revealed how much pee is in a pool, so perhaps think twice before taking a dip at a local swimming pool, as it may cause serious illness

All 31 pools and hot tubs tested in sports centres, hotels and private homes in Canada had wee.

The average swimmer passed 70ml — about one-fifth of a typical soft drink can, experts found.

The wee itself is sterile but reacts with disinfectant chemicals in the water — such as chlorine — to form harmful byproducts.

These have been shown to cause eye irritation and respiratory problems, such as asthma. Extended exposure has also been linked to bladder cancer.

British swimmer Rebecca Adlington and Americans Ryan Lochte and Michael Phelps are among Olympic gold medal winners who admit having peed in the pool.

A fifth of amateurs have done so at least once, previous surveys reveal.

The researchers, from the University of Alberta, in Canada, examined the water for an artificial sweetener used in a range of foods and drinks that passes straight through the body and is passed in urine.

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