Not an expert but why it makes a lot of sense: you can have a lot of different sensors and do lots of test for different pollutants. But to do test, you need to know what to look for. if one day, water will get contaminated with an unknown substance, that is harmfull towards living creatures, clamps will still get hurt. <br>Only hope that those clamps react to a big spcetrum of pollutants and if, for example, some terrorist state tries to poison water supplies, clamps wont get outsmarted that easily.