Identifying what it is critical. In my experience many folks call Coontail, Elodea or Millfoil; Hydrilla. To an untrained eye it can be very hard to tell the difference. Recommendations for the BEST treatment for what you have will be different.
For every 10 ponds/lakes and ponds I see, where the landowner tells me they have hydrilla 9 of them actually have
Coontail. Very common mistake. Grass Carp love hydrilla and will tolerate coontail when most other aquatic weeds have been eaten first.
The good news is on 2 acres you can treat for just a few hundred dollars.
Check out this website and it will tell you how to identify and treatment options.
Aquaplant