Hello- I am looking to potentially have a rock waterfall built onto my existing pool. Currently I have a 2 way valve ( I think) returning water to pool through the return jets and the 2 bubblers. The valve can be adjusted to raise, lower, or turn off the bubblers to my liking. Can that valve be changed out to a 3 way valve to provide water to the waterfall? The pump is year old 2 hp Pentair whisper-flo. I've been told that is enough hp to do so. I understand that the ideal set up would be separate pump for the waterfall, but would prefer to use what I have to keep cost down and limited pumping station area. Thank you for all your input