My old pump was broken and I was forced for a new pump to keep an eye out. For my 15.000l pond and the filter system employed I needed at least a capacity of gross 4500L / h. Since the Pontec was 50855 highly rated and with 5000l / h performance exactly met my expectation I ordered this pump. The commissioning was easy and everything was well suited to each other. In particular, the lower power consumption of 60W compared to my old pump with 110W at an acceptable price were decisive. Therefore, 5 stars with the expectation that this pump stops without problems even at least 10 years.