Our pond has a capacity of approximately 10,000 liters. After 3 days of operation in the water was a lot clearer than the old pump and you could see every stone in the pond. Pure excitement! It is not very loud and can be wonderfully hide due to their flat construction under the bridge. Also it is much easier and less complicated to open and clean, than our old model of Mauck. We are very satisfied. If this pump break down, we would buy it again this model.
Addendum spring 2015: The pump still runs perfectly and silently. It contributes definitely to the fact that we now even in midsummer at high temperatures always have a clean pond. We have the winter the pump and filter system (from Mauck) each wintered in the cellar. We can really recommend the pump even after prolonged duration. A powerful, small "workhorse" :)