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Boy in swimming pool. (brokenchopstick, Flickr)I recently received this question via email, so here's the answer. No. There is no chemical which changes color when someone urinates in a swimming pool. There are dyes which could cloud, change color, or produce a color in response to urine, but these chemicals would also be activated by other compounds, producing embarrassing false-positives.

Though there is no such thing as urine-detecting dye, you can purchase signs that prey upon the misconception that a urine indicator exists. The signs, which warn the pool is being monitored with a chemical 'wee alert', are believed to be an effective deterrent against urination in a pool, particularly with adult swimmers.


February 1, 2010 at 3:28 pm
(1) tudza says:

Even if there were, how would it fight against the overwhelming power of chlorine?

No, the solution is real-time heat imaging ;-)

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