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Friday, March 3, 2017

Health security

University of Alberta scientists study urine levels in pools


A picture taken on August 10, 2016 at the Maria Lenk Aquatics Stadium in Rio de Janeiro shows an expert taking a sample of the the diving pool water of the Rio 2016 Olympic Games prior to its analysis. Red-faced Rio Olympics organisers anxiously waited for the diving water to turn back from a nervy green to classic blue as a lack of chemicals was revealed as the cause of the colour changes.
Canadian researchers have figured out a way to test just how much urine can be found in a swimming pool.
The results? In some cases, about 0.01% of pool water is urine.
It is a small amount but likely more than enough for most swimmers - and enough to be a public health concern.
In one instance, the researchers estimated that an 833,000-litre (220,000-gallon) pool could contain about 75 litres of urine (20 gallons) on average.
A smaller 416,000-litre (110,000-gallon) pool was estimated to contain 30 litres (eight gallons).
The University of Alberta researchers analysed more than 250 samples from 31 pools and hot tubs. The samples were collected in two undisclosed Canadian cities, from public and private pools, hotels, and hot tubs.

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