I do not have a gage. Two winters ago I was not getting air, what had happened is condensation built up in the line, froze, and then the line popped off of the pump. 40 foot extension ladder, white knuckles, etc, I was able to fix it.

When I checked it yesterday, there is definitely air going to the lines which supply the diffusers.

I am very confident there is aeration, but we have had a lot of still/cold days, enough to allow the ice to get real think. My assumption is the bubbling action is just not going to be enough to open up holes.

I also hate to just walk out on the ice over the diffuser and fall through.

I had a few winters where I had no aeration at all and the ponds were iced over for months without fishkill, but I just have a feeling that this year could be different.