OK here goes. My pool originally had a small, fiberglass type water fall 5' wide by 3' long by 3' tall. 1 1/2" plumbing was installed tied to a separate pump. Behind my pool is a 7' retaining wall. I recently removed the prefab waterfall and built a rock waterfall from the retaining wall to the pool. It is probably 10' wide and 7' tall, cascading down three tiers into the pool. My pump is at ground level, with the output side originally running about 30' in length, then up the 7' into the holding area for the beginning of the waterfall. I am not getting enough water to fill the holding pool and create enough of a waterfall, so this is my question. I am thinking of trying one of three things.
1. Keeping the original pump (1 1/2 hp) in place and installing another in line at the top of the retaining wall. Will it be plausible to plumb from one pump into another?? Would this take care of friction loss, the overall long length of the run and the rise in elevation and hopefully increase the water at the holding pond??
2. From where the 1 1/2" plumbing comes out of the ground, what if I "t" off and plumb the two pumps separate, giving me two separate outputs. My question is can the one 1 1/2" line from the pool supply two separate pumps, or would they try to "suck" from each other??
3. Would simply moving the location of the pump from the current position to the top of the retaining wall help. This would make the pump "suck" the water the entire length and rise of the plumbing and "push" it out just a few feet from the holding pool instead of "sucking" at ground level and then "pushing" it the entire length and rise. Which would be better.