I have a fiberglass pool with a separate spa- no spillover. Although they share common equipment I have always ran them separately, which is a pain and I frequently forget to change over to the spa until I notice it looking a little hazy (or green ).
Jandy valves are used to alternate between the pool and spa. I have always turned the valves completely one way or the other to run either the pool or spa, but the valve can be set for both to be open and now I’m wondering if I can’t open both and let them circulate together.
I have a Jandy valve controlling the intake from the skimmer and main drain and I frequently move the valve to control more/less intake from one or the other. I would think I could use the spa/pool valves the same way. What concerns me is drawing too much from the spa or depositing too much back in. I can experiment with the valve, how much is open vs closed for each side, but will the water flow stay constant over time (I know the valve won’t move)? If I get it balanced can I feel confident that I can walk away and not worry I’ll come back to an empty (or overflowing) spa? It seems logical that it should work, but am I missing something?
My digital camera is not working, so here is a drawing of the pool plumbing: