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Hot tub overflowing when pump is running for pool

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Hi - 

I have an inground pool and separated (but connected) inground spa. The spa is a few inches higher in elevation than the pool. They are running off of the same pump/equipment. I have an issue where spa is overflowing when pump is running for the pool. When finished, the spa then drains to a level equal to the pool (which is too low). Is this a check valve issue - if so I am not clear if I have one or where it's located? Is an adjustment needed in the Jandy valves?

I have attached picture of pool and plumbing/equipment layout.






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  • 3 weeks later...

Or a clog/restriction in the overflow pipes from the spa to the pool? Do you have overflow lines to the pool?

There should be a check valve in the return line back to the spa (If that is the design). Or perhaps the spa is supposed to run independent every day (for a short time) isolated from the pool to keep it clean. 

Did you just buy this house?

A picture from the other direction may help (taken from the heater end) to show the return valve better.

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