Up to this point there were still 5 stars.
But: The service life here in a 20 liter tank, densely planted with some (now 30-50 + .. counting is where so very very difficult as good as can hide) shrimp is much too low. After 1-2 weeks, the flow slows down significantly after about 4 weeks, the filter must be cleaned starts humming loudly and.
Cleaning is the second problem: Either follow one of the motor part and the filter and opens the filter already in the pool - with the result that everything distributed on the filter in the tank, or you try to solve the suction cups (here contrary to some other reviews are fairly persistent and nearly not come off). Anyway, it's always an additional or less big mess in the basin.
The filter material can be washed off though, matted but fairly quickly, so it must be replaced after 2-3 times washing. For 3 Replacement cartridges you get almost a new filter.
