MNFish was telling me he has seen the air actually lift the ice off the water and make a dome over the diffuser which leads to the diffuser not cutting through the ice as fast.
I wonder if that could be happening to you guys?
QA - If you are only dealing with short periods of ice cover is Winter aeration and diffuser placement that critical?? When I initially asked about water temps for some reason I was thinking you were in Michigan. Big difference between there and Missouri.
