Hagen

There are a few things that will cause the bubbles to cease in the mini filter.

Take out the impeller and clean the magnet and the impeller housing.

Pull out the outlet nozzle and clean.

Take off the clear plastic pipe and scrape inside the part it fits on to with a paper clip.

Make sure the impeller cover is put back the right way round.

Make sure the flow control switch is on max +.

Only have the top of the filter 1cm under the water.

Try running the filter without the black bobble on the end of the clear pipe.

If none of the above makes the filter work, then please take the filter back to the store and they will take a look at it for you.