Thank you for the pointers.

My filter is a Pentair Clean & Clear Plus, CCP420. Filter area is 420 sf, flow rate 150 gpm. I found maintenance receipts from the previous owners; the filter was installed 9/04. I think the pressure gage usually reads about 10psi when it's running.

The pump I have is an A.O. Smith "conservationist" 1.5HP - or at least that's the motor. It was installed 2/05. At $249 (plus labor) I'm guessing they only replaced the motor. (????) Service factor says "1" on the side.

The spa does NOT have its own pump; it has four jets.
The pool sweep DOES have a booster pump.
Looks like the pipes are 2" ID. Which lengths do you need? The distance from the equipment to the farthest point is about 40-45 feet.

I'll check out that website now - thank you for that.