Spa loosing water to pool overnight

grayrnc

New member
Dec 17, 2024
1
Texas
I’ve rebuilt the two main valves with new gaskets also changed the check valve but the pool still pulls water from spa when pump is off. I’ve tried completely blocking the pool side at night but spa level still falls.
 

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Welcome to TFP.

It seems to be all too common as problem.

It looks like you have two check valves stacked on your spa line.

What are the pipes to the right or the POOL RETURN pipe?

What automation system do you have?

The main valves do not make a difference when your spa pipe is partially open to allow your spillover to run when in POOL mode.

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