Let's try this one more time. We treated it heavy with Navigate and that seems to have gotten rid of most of everything except the following, which has now taken over like crazy. It is covering the entire bottom now. We have rake out several wheelbarrows full of this stuff. Has a pretty nasty smell to it too. Almost looks like Chara, but then I looked at some close ups of Chara and it is slightly different looking than this. Then we thought Coontail, but again, it looks slightly different.
This is all completely submerged and reaches up to within a foot of the surface in most places. The Navigate did not seem to phase it.
