I am redoing my whole setup and looking for recommendation for a pump that is not going to be in a skimmer but just sit in the pond covered by a flat rock on top only to be invisible. It needs to run about 4,500 gph, be pretty energy effective and be able to run a waterfall that is about 6 feet up and has a filter up on top. Reliability is a factor of course. I would rather spend a bit more now than do it early. I had a Cal pump magnetic pump (tall black plastic thing) and the piece of crap lasted 8 months.