How much pee is in our swimming pools? New urine test reveals the truth

Olympic swimmers admit to it and it seems many of the rest us are peeing in the water too, with a new scientific test finding up to 75 litres of urine in public pools

It is an antisocial act that normally goes under the radar, but many swimmers have long suspected the truth: people are peeing in the pool.

Now scientists have been able to confirm the full extent of offending for the first time, after developing a test designed to estimate how much urine has been covertly added to a large volume of water. Regular swimmers with a keen sense of hygiene may wish to stop reading now.