Got a horrendous water bill and narrowed it down to the pool.  The spa drains down 2/3 overnight when on a normal schedule and then has to refill. I've had it cut off today and it continues to drain below that point.  I've got it cut off and have contacted multiple leak detection companies that are all booked for months.  It's going to get really cold so it's going to have to run some for freeze protection.  The check valves are good and holding.  I've used each Jandy valve to lock off the check valves and isolate other potential issues.  Same result the spa leaks back into pool or maybe elsewhere I have no idea.  I've run the system skimmer only and main drain only.  Have air bubbles in pump on both, but more if set to main.  Completely shut off main, but still leaks down.  Same with skimmer only.  Don't see any leaks at the equipment.  Any ideas?