My set up has a pool and with connected hot tub. I have a 3 way Jandy valve just before the pump and another one after the heater on the return side. When I run the pool the water in my hot tub drains pretty significantly (almost half in an 8 hour session). When I run the hot tub, the water level rises and eventually begins to overflow into the pool. Are Jandy valves known to fail over time? Anyone else have the same issue? Does the valve need to be cleaned out/repaired or does it need to be replaced?