Brand new Pool owner here with some issues. As a matter of fact, we're just now getting ready to pour concrete. So we have two boddies of water, the main pool is a 16x40 fiberglass pool with a semi-circle tanning ledge 8'x16'x10". (see attachments for pools & plumbing). Both pools are running through the same system and I'm having some issues controlling the water in the tanning ledge, either fills up or drains, depending on the positioning of the valves. From my research, I understand that one solution is to use an "overflow" line from the the tanning ledge to the pool, or a automation system that runs both pools separate. I don't really want to use an overflow line because I think that would keep the water level way too low and an automation system (+8 valves) would be really expensive.
Is there another solution to this problem? I wouldn't be opposed to running the tanning ledge "lean" (as in, draining) when filtering but I also do not want to run my pump dry. Would putting a check valve on the intake side of the tanning ledge do the trick? So in my mind, the way it would work is the pump turns on and slowly circulates the water out of the small pool. When the water level falls below the drains, the check valve closes the intake until enough water is returned into the tanning ledge to open up the valve.
Just FYI, the plumbing description is... on the right is intake (from right) spa, shallow skimmer, deep skimmer, main drain and on the left are returns (from middle) main return, shallow, middle, and deep return, and spa return.
Any advice would be appreciated... please don't mind the mess!