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The filter (CristalProfi) will restart automatically when disconnected from the power supply, provided that there is water in the filter circuit.
The filter rotor is subject to constant wear. We recommend replacing it. This will restore smooth operation. Make sure that the noise is not caused by air pockets. The warranty covers assembly and material defects. Wear parts such as the pump impeller and axle, as well as damage caused by external influences and improper handling, are excluded from the warranty.
There is no general answer to this question. As with a car tire, the duration and intensity of use are decisive. Many customers use the rotors for several years without noticing any noticeable change. Heavy use of the rotor will shorten its service life. With a car, you are familiar with wear and tear caused by heavy braking, mechanical damage, and high mileage. The following factors apply to a rotor: 1. Operating time in hours 2. Throttling of the flow rate (max. 50%) and thus lower cooling capacity 3. Dry running when changing the water (see 2.) 4. Mechanical damage (e.g. caused by snails, improper installation after removal, etc.) 5. Heavy soiling As this is a wearing part, the rotor is not covered by the warranty. For a long service life, you should clean it regularly. This will prevent increased running noise. The rotor housing, rotor, and axle can be cleaned with a suitable cleaning brush. If the rotor needs to be replaced due to wear, the entire set, including the rotor with axle and 2 rubber bearings, must always be replaced. This is the only way to ensure proper functioning and smooth operation. When removing the rotor and axle, a rubber bearing often gets stuck at the bottom of the rotor housing and is very difficult to remove. JBL has developed a special tool for this purpose, which is available from pet stores under the name "Pull-out aid for rotor bearings." A useful cleaning brush for the rotor housing is also included with the tool.
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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