I have raised spa with overspill, so when the pump is running the water is spilling into the pool. Everything is fine when pump is running. My problem is that, if I leave the the SPA drain open and the pump is not running, all of the water prom the SPA is draining into the pool. I did a little research and it is appearing the water is leaking from the SPA drain -1 through the skimmer suction-3 and the cleaner suction-4 (if I leave it open) into the pool. I'm not sure if the SPA water could be draining into the pool through the pool main drain? I only have actuators on the SPA and pool drain.See picture.
I'm sure there is something wrong with the piping design or there is/are valve(s) missing, but need help to figure out what could be the best option.
Is there a valve I can install on the spa drain pipe, so it can open when pump is running and close when stops? Or I have to install check valves on the skimmer and cleaner suction?
Please, help me out with ideas!