Cynics, rejoice. It’s official - people are definitely peeing in swimming pools.
Scientists have now confirmed what many of us have long suspected.
The scientists, from the University of Alberta in Canada, developed a test that estimates how much urine has been added to water, by measuring levels of artificial sweetener acesulfame potassium, which is commonly found in processed food.
They measured the levels of the sweetener in 31 swimming pools and hot tubs in Canada over three weeks, and found swimmers had, er, relieved themselves of 75 litres of urine altogether.
It sounds like a lot, but just for some perspective it looks like this: