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The spa has been drained for a week while I’ve been checking things, have not added any water. When spa is not isolated I’m adding water twice a week. 2 or 3 inches per.

I’ll get a pic tomorrow. Haven’t really looked at valves, just know water is disappearing.

Plugged all holes and water level still goes down

None of those.

Replaced check valve in return line, same problem. Not sure what you mean about Automation.

Overnight the spa drains down. Next day pump turns on and fills spa back up and pool level goes down. When spa is isolated pool does not lose water.

The spa is raised above pool.

I believe my spa is losing water when the pump shuts off, but the water is not going into pool. If I isolate the hot tub the pool loses no water. When the hot tub loses water it only goes down enough to be even with pool water. I’ve installed plugs in all holes in hot tub and still loses water...