Re: the last post, the article mentions that some places use clams to test the toxicity of the water. It’s like that in Warsaw- we get our water from the river, and the main water pump has 8 clams that have triggers attached to their shells. If the water gets too toxic, they close, and the triggers shut off the city water supply automatically.
The clams are just better at measuring the water quality than any man-made sensors.
Edit: check out this documentary trailer : https://vimeo.com/408820791
God Bless Our Troops
They hot glued a spring to a clam and gave it full control over the water supply