We had the same problem with our whisper filter of the water going back out over the intake pipe, to solve this we took out the filter wool bag that you use in it and just replaced it with normal filter foam, its not as fine and doesnt get clogged up as easy with stuff, the main problem is restictions from things getting dirty. As for it being noisy, ours was fair quiet but it did "whisper" if its getting rattly, you may need to replace the impeller.