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You don't need much to investigate the cause. For internal pumps and filters, all you need to do is keep the device free in the water without it coming into contact with other objects. It is important that the device remains completely submerged and only comes into contact with your hand. If the running noise is now quiet, there is no wear on the rotor, but rather resonance transmission to surrounding elements such as the cover, the base cabinet, or anything adjacent to the aquarium. You can then decouple this by making small adjustments. For external filters, make sure that the filter has 4 rubber feet on the bottom (except for the CPe1901/2 model with casters) and that it only comes into contact with the cabinet there. Place the filter next to or in front of the aquarium on a soft surface (e.g., a thick towel) to test it and make sure that the hoses do not come into contact with the base cabinet. Many aquarium cabinets act like the sound box of a guitar with a sound hole. Even the smallest noises are amplified by the hollow body. Therefore, a soft surface and, if necessary, side insulation are advantageous if the resonance is amplified. Hoses lying on top or very rigid installations with additional attachments have the same effect. The test with the filter outside the cabinet, as described above, provides information about the actual operating noise. Loud running noises are caused by a worn rotor, excessive load on the rotor due to a reduction in performance (contamination or throttling), and too little height difference between the water surface and the filter head, as described in the instructions. Another possibility is that CO2 sucked in from the fertiliser system or air from the diaphragm pump, which is fed in near the filter, causes loud running noises.
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