After many failed attempts with other pumps (of "poor performance" to "defect in the shortest possible time") is now a very well-functioning pump with excellent performance. Something for the chosen location (right next to the terrace), but after installation in a soundproof housing (self) that is loud also no longer an issue. In conjunction with the "air ball 50mm" excellent pond aeration.
Addendum October 2013: The pump still runs without complaint. Strong buy recommendation !!
