Quote Originally Posted by cevans View Post
A lot of times they might use a mix/liquid of copper sulfate (I think that is name of it) and it takes the oxygen out of the water and kills the weeds. Fish just move out of the area till the oxygen levels come back after a few days as it is not a poison. See if you can check tho and see what they are using.
Just do not try to poison the entire lake at one time . I do a third of the lake at a time .