I'm a novice with pools but believe to have a mechanical understanding of why I'm placing the mechanicals under the waterline! Actually there's two reasons for moving the equipment; 1. flow efficiency, and 2. an outdoor kitchen wood burning oven over the equipment bay... aggressive i know!
Your quote "head problem with the slope" is one of my concerns with mechanicals under the waterline. I was making an assumptions that there would have to be an additional something between the pump and the pool to stop the water from entering the pump while its down for cleaning of filter and pump?
In my search; I found two sets of schematics literally stating above waterline install, having me believe that there is more to it then - my assumption - of just putting a riser between the pool and pump.
Does this make sense?
Also my lingo is not up to speed, what do you mean by "and add the necessary "L" to divert the water", is this the riser issue I speak of?