Theodore, I have the same problem with the diffusers kicking up solids from the pond bottom. Pond is very similar to yours in depth and size. I run 6 Kasco diffusers using two aerators in a 3.5 acre pond for some of the same reasons u mention. I have tried several different methods to solve this problem but none of them have worked. I am now waiting for warmer waters to try something different. I have been told I can raise the diffusers 18" off bottom, but that would defeat my purpose and after many attempts of different things tried, I am not sure that would work either. So for now I am waiting and hoping after this winter of pumping air 24/7 it will eventually stop disturbing the loose stuff around the diffusers. If you find something that works please post it up. I bet we two are not the only ones having this issue.
