I have read several posts on FA control. I understand you approach on nutrients, light and beneficial plants and I am on it. Definitely on that path. However, I have one or two stubborn patches of FA that I am going to spray.

My question is how the heck do you get it to be affective when it is just under the waterline? I have tried a little strong 2-4-D. It didn't seem to phase it at all.

Thanks in advance.