I am bidding on a job to do 3 water falls for a customer. Each pool is about 8' by 6' wide and at least 3-5' deep. All 3 pools run into a big pool....one continuos stream. but the bottom pool gets pumped back up to the top.... property is on a hill so gravity is on my side. Question is what kind of pump do I need to pump water back up to the top? He wants a highflow "sewer" type pump that can handle leaves and junk.