Studies on 2 public swimming pools in Canada have recorded the amount of the artificial sweetener acesulfame potassium that is present in many foods and is passed unchanged through the body to be voided in the urine (https://www.theguardian.com/science/2017/mar/01/how-much-pee-is-in-our-swimming-pools-new-urine-test-reveals-the-truth). The workers conducting this study have estimated that, over a 3 week period, the swimming pools of around 830,000 litres each received about 75 litres of pee (equivalent to a dustbin full). They have also recorded substantial quantities of urine in hot-tubs. It appears that you get really close to your neighbours in these locations!
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