Hi, I received a new psk 100h from dr. fosters today and when I plug the skimmer in it is making a loud buzzing noise. The skimmer is flowing water the way it should and the pump is seated properly because I checked it. The pump is silent when I stop the air flow, the pump only makes noise when the air is entering the pump. Is it normal for the pump to be loud when it is new? Does it quiet down as it breaks in? Thank you very much for your help, looking forward to your help with the issue.