I have a friend who has a place (along with ten other homeowners) on a 2 acre pond in western Washington. It is reportedly deep, exact depth unknown at this time, with a year round surface stream inflow and outflow, as well as a spring at the bottom. The water has lots of color, sounds like more than just tannins, and a thick layer of muck. There are frequently "funky smelling bubbles" surfacing. The homeowners association stocks the pond yearly with 6" trout, with trout actually caught less than 12" being the norm, with a rare lunker. They are off the grid.

So, my question is, if they find out that it is 40 feet deep, if they want to clean up their pond, do they really need to aerate all 40 feet? After a certain depth, is there a "law of diminishing returns?" I'm guessing that, especially being off the grid, and presumably with a solar aeration system likely being the way to go, that a system that can aerate down to 40 feet may be cost prohibitive