Still at the drawing board here on the new pool. I asked for a 3rd sheer descent from 2. The builder is now saying I need to go from a single 2 HP (which would have powered everything from the filter, vacuum, and 2 descents) to another pump. I would have a 1 1/2 HP to filter and vacuum my 400 s.f. pool. I would have another 1 1/2 HP to power 3 18" sheer descents (may go to 3 24" descents). I talked to the project manager and he suggested I go to a 2 HP pump for the 3 descents as he thinks the 1 1/2 HP for the falls may not be enough and it's good to have more pumping power and the cost of the pump is only $100 more and power consumption won't be much more since I am not going to be running all that much in reality.