Here's a draft layout of my plumbing.
Plumb Diagram TFP.jpg
Any comments/corrections appreciated.
My biggest question is on return pipe size. Do you think I can just step down to 2" pipe for all of these return lines? Sure would be easier to just buy everything from Lowes/HD instead of hunting down 2.5 from a plumbing supply shop (and it would be much cheaper apparently).
I was also wondering about the spa drains (that run to the VF pump, filter, etc) siphoning the contents of the spa into the pool when the filtration shuts off? If this can happen, how do you prevent?