My pond is .5 acre with about 7 foot average depth. 4 acre feet or under. I am a 72 year old widow, some what active. Last year my pond was covered by coontail. I manually harvested it by pulling out by clumps into a canoe. Put oar into water, swirled it until gathered a large clump then pulled into canoe again and again. It looked much better. So now I am concerned about the growth again. I really don't want to do that again. I have been looking into fluridone. Expensive.

Questions:
1. What effect should the self harvesting have on the growth this year.
2. Should I wait to see what happens this year before treating.
3. Is Fluridone overkill?
4. Something better?
5. I have been looking at Sonar RTU. Any advise on this product or any recommendations would be sincerely appreciated. Sonar RTU sounds like the simplest but can't find many reviews on results.
My pond has no outlets. Basically self contained. 100 year old pond probably. Some fish but don't use it for much.
I like the long acting possibility of Fluidone but price could be an issue.
Also have looked at:
Diquat (Rated: Excellent)
Endothall (Rated: Excellent)
Fluridone (Rated: Excellent)
The quick acting Diquat and Endothall a lot of work. Multiple appilcations. Which is harder for me. I have a 15 gal sprayer and the spray doesn't reach to the middle of my pond which is about 100 feet wide.
I have been researching this for hours and hours over the years and hoping for some easy resolutions.
Thank you before hand.
Any help, suggestions appreciated.