I have a new 27' (50" deep) above ground pool in which I built a stone waterfall to the edge of it that is 4 ' wide and the plumbing going to it is about 7' to the left and 7 ' above the main pump that the installers installed it at. The pump is a Hayward 1.5hp pump with a 3hp rated doughboy sand filter (it's big). The flow of the pump is very strong and pushes two jets into the pool. When I turn off one jet and turn on waterfall there just isn't enough pressure or consistent pressure to keep the water fall pushing strong. It sometimes has enough pressure to push the water away from the wall and looks great, then it losses pressure over 30 mins and is dribbling down the wall. Or many times it just dribbles down the wall.
I want it to be a solid sheet of water coming out all the time. Do I need a bigger pump? Or do I add a pump for just the waterfall? And if I add a pump, does it draw off the same water inlet that the main pump is drawing off of?
(Please excuse my lack of correct industry terminology, newby here)
Side note: when I first starting to use it, I had to backwash my filter for a minute or two then the pressure was enough to turn on water fall (after placing the filter back into filter mode) to last for an hour or two before the waterfall lost pressure.