With the brutle weather this week (-30 below with the wind chill), I checked my aerator to see if it was still working. I lost a bearing in the pump I was orginaly using and repalced it with and old airbrush compressor I had laying around.

The open hole in the ice went from around six feet in diameter to about 10". The water was still rolling although, the hole has closed in. It took almost two days for the air to reopen the hole after the pump failed.

Anyone have any issues with complete freeze overs while the compressor is still pushing air?