Don't underestimate manual removal. Manual removal can do wonders for a small pond (1 acre). No cost other than your labor. It opens things up for the fish/fishing. But best of all it removes the nutrients from the pond (they are bound up in the removed weeds). Not so for other options as they are recycled (unless you remove the carp or tilapia or fish).
Very true, just don't try to manually remove Elodea or Hydrilla. Been there done that. Sure you remove it in the short term but the fragments cause it to spread like wild fire. We use the manual removal method on other weeds though. Get one of those weed cutters and a weed rake and you can remove a lot of stuff in a relatively short time period.
