I have a 3/4 hp. (Insert gorilla sounds here)
Well excuuuuuuuuuuuuuuuuuuuuuse me!

Actually the 1/2 hp is too big for my small ponds which is what I got it for originally. It stirs up the bottom a little. I'm glad I got it now for this emergency situation. I'm gong to get one of those 1/8 hp deals in the future for possible emergencies in the smaller ponds.
What surprises me is D.O. is only 7.5 ppm in the open water that is 35.2 F. I would think it would be close to saturation with it being open and moved by the aerator. But I'll take what I can get and 7.5 is excellent compared to 3.5!