More Info:
I planned the plumbing this way on purpose. I do not want to use the electric spa heater to heat the pool, at least not directly because, well, I don't think it could. If it could manage to heat the pool the electric bill would be astronomical.
Instead I chose to plumb the Pool Pump so that it could draw water from the spa or from the pool, and return it to the spa or pool. This way I can use the sand filter to clean the spa water instead of the cart. which I can remove(in favor of a skimmer basket) to improve flow. The other, and main reason for hooking everything up this way is so I can heat both the pool and the spa with the 120,000 BTU's of solar panels sitting on the roof.
The Pool Pump and the Jet Pump are on the same circuit so to ensure they don't run at the same time and overload it, I'm going to put them each on a timer and set them so the Jet Pump can't come on until the Pool pump shuts off. The Jet Pump is controled by an air button so it won't come on automatically, it will just have the ability to be turned on.
This may change if I put them on two seperate circuits. I'd still keep the timers, but it would just be so that no one turns on the Jet Pump while the Pool pump is still in Spa Mode. This would cause both pumps to fight eachother and push into a single 2" pipe with only 6 jets at the other end. Putting them on seperate circuits would enable me to run them both atthe same time. I'd be able to use the Spa and filter or heat the pool at the same time.
As you can probably tell, I've put quite a bit of thought into this whole build. Though, ALL imput and comments are ALWAYS appreciated!
Adam