Damned if you do damned if you don't.
Milfoil if left unchecked will take over and choke out everything. If there was a more cost effective and equally efficient way to get rid of the stuff I'm sure it would be used. Putting divers in the water and hand pulling is a technique that has been used but I think that is more for dealing with isolated areas not really a good solution for treating a large area.
I had read at one point there was some investigation into studying or looking at the possible impacts of introducing a kind of fish that eats the stuff. Seems if that could be done without any ill affects that would be a nice solution. Of course the long term is hard to really know 100% too.
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