Just upgraded to this pump for my 600-ish gallon pond. I installed it last weekend and it's working beautifully and quietly. One suggestion for Danner: while overall their pumps are sturdy and reliable, the faceplates on them - which includes the output port - are plastic, which becomes a problem with repeated attaching and reattaching of hoses. The threads wear down or get damaged, particularly with metal connectors such as when I hook on my garden hose to drain my pond. My solution has been to permanently keep a plastic hose connector on it as I switch from waterfall line to drainage hose. Still, very happy with this pump and Danner products overall.
Rating: [4 of 5 Stars!]