The heroic mollusks that guard the water supply of an entire city
boingboing.net
Poland's cities, including Warsaw and Poznan, employ unusual teams of monitors to ensure that their water supply is safe to drink
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The original was posted on /r/todayilearned by /u/Wordsworth_Little on 2024-12-20 16:12:12+00:00.

Original Title: TIL Poland’s cities of Warsaw and Poznan utilize teams of live mollusks to detect impurities in drinking water at 50 discrete water treatment plants. When 4 or more mussels are detected to have closed (using magnetic sensors) the water supply shuts off.