A 1 ac pond you should be able to do it from a tank on shore with a few hundred feet of 3/4" garden hose. A jon boat might be too tippy to put that much weight up high and spray it off with a trash pump, plus it's so caustic you might eat the aluminum if you don't get it all rinsed off and neutralized.
I know one guy that did the 250 gal tote with trash pump and a spray bar on a pontoon. Remember to always keep the people upwind of the spray.....
The banks are so steep that getting around it with anything but a boat is not really an option.
