I have a grotta with a watefall - slide custom built and the water output for the watefall is very insufficent, the pb put a hayward tristar 75/120 gpm watefall pump on it , the watefall is about 6ft high i would say and about 6ft wide. Even with me turing the valve off for the slide so the water only goes to the watefall its still very low, i will try and post some pics tomorrow of the waterfall on. Anybody have any ideas ? or websites, ive been looking all over trying to find someone that knows this information, thanks. Also the pump is about 40ft id say from the waterfall .