I'm still having an issue with the buzzing pump. I was able to tweak it and get it quiet this weekend with a nice quiet hum, but last night out of the blue it just started making a very loud buzzing. I tried restarting and stopping the pump to no avail. I had to wiggle the intake pipe which quieted it down a bit. I reseated the impeller this morning, and although it not the loud buzzing I heard last night, it's still louder than what it should be. It's definitely an issue with the impeller, and not with the pump touching the sides/bottom of the skimmer. Maybe I just have a finicky impeller. I just didn't think I'd have to constantly tweak it every time the pump restarts to get it running quiet.