What if you attached a piece of 3/8 or 1/4" pipe with a couple small holes drilled in a cap on the dispensing end to the sprayer, and released it under water at the depth needed to treat the deeper stuff? I also have a coontail problem but can't spend the 5 bills right now. I rake the areas we fish along with about 100' of the dam occasionally. It's time consuming, back breaking work but a couple times a year helps. I only have 2.5 acres though, not 5.5.

FH