05-14-2009, 04:04 AM
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I run four of the Emperor 400's and two Emperor 280's. While they are not dead silent,, they are not what I would call loud and sometimes ,I must look and see that water is still entering the tank to ensure that they are running. I have found that if the J tube is pressed too firmly down onto the impeller that the filter is considerably louder than otherwise. Magnet goes on the bottom,and plastic fins on top when placed in the well that impeller is seated in.
Have also found that new filters,,sometimes become less noisier after a week to three weeks and that cleaning the impeller with brush provided ,,and the impeller housing,, with vinegar and HOT water will sometimes help considerably in the event the impeller and housing become coated with gunk which will happen. Hope some of this helps.