Yes, I will post pics when I get home tonight. Basically, next to all my other piping at the pool pad, there is a pipe coming up out of the ground about 4 feet high with a 90 at the end, and it is open. It has every appearance of being just an air intake. At my spa (pool/spa combo), there is a 2 way on/off hand turned valve that operates the spa jets when in spa mode. When I turn the jets on, I can go to that air intake pipe, block it with a tennis ball over the opening, and the jets go off. Take the tennius ball away and the jets go back on. So I thought I would just plumb in a valve at that pipe, put it on an acutator, and keep it in closed position when not using the spa.

My other pool components are pretty straightforward: single 2 HP Whisperflo single speed pump, sta rite DE Series 3 Filter, and a Sta Rite Heater.

I can't imagine where that air intake would be utilized except for the spa jets.

Thanks again for your replies and any further comments suggested by the foregoing information about my set up.