Baffling In Ground Spa Leak

poolheat101

Member
Sep 29, 2017
8
Miami, FL
Have an in ground spa and pool. Spa is raised above pool by a couple of feet (see pics attached). Some mornings before the pump comes on I have lost half the water in my spa (about to the jet line - approx. 500 gallons). Others mornings there is negligible water missing. Does not seem to be temperature related. I have checked the jets for leaks using dye. I have run many tests and have determined that if I allow the pump to be turned off at the end of the day by my Jandy system, I lose half the water by the next morning. If I manually turn it off at the end of the day before the timer does, I lose almost none by the next morning. Sounds weird, I know, and as an engineer, this is keeping me up at night. I have methodically verified this multiple times. Regardless, the pool level does not change up or down. I have verified that regardless of which method I use, the valve positions do not change on turn off and turn on. Any help or ideas would be appreciated. Thanks.
 

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Esloser

Well-known member
Jun 23, 2016
520
Millville, NJ
Seems that would put the water into the pool rather than disappearing - true? Pool level does not rise when the 500 gallons goes missing.
Yes, that’s true. Although, depending on size of the pool, the rise could appear negligible.

Weird that it doesn’t leak when shut off manually. What do you do to shut it off manually vs using the automation?
 

Jimrahbe

Mod Squad
TFP Expert
LifeTime Supporter
Jul 7, 2014
15,415
Bedford, TX
ph,

Have you, or have you not, checked the check valve that prevents just the problem you are having???

When a Spa drains down to the returns and stops, it is almost always the check valve.

How about posting a picture of your equipment pad showing your Return valve and any other valves in the general area...

Thanks for posting,

Jim R.
 

poolheat101

Member
Sep 29, 2017
8
Miami, FL
I do manual shutoff from interior Jandy control and using the breaker outside. Both have same result - negligible leak.

- - - Updated - - -

ph,

Have you, or have you not, checked the check valve that prevents just the problem you are having???

When a Spa drains down to the returns and stops, it is almost always the check valve.

How about posting a picture of your equipment pad showing your Return valve and any other valves in the general area...

Thanks for posting,

Jim R.
Have not looked at the check valves as I assumed that since I had a large net loss of water, as opposed to going between the pool and spa, that they are not suspect. What is the best way to verify them? Pic of equipment attached.

Thanks.
 

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poolheat101

Member
Sep 29, 2017
8
Miami, FL
Yes, that’s true. Although, depending on size of the pool, the rise could appear negligible.

Weird that it doesn’t leak when shut off manually. What do you do to shut it off manually vs using the automation?
I do manual shutoff from interior Jandy control and using the breaker outside. Both have same result - negligible leak.
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
23,065
Laughlin, NV
Just wanted to be sure we are all on the same page - you are adding large amounts of water to your system due to the spa level going down. Correct?
 

Jimrahbe

Mod Squad
TFP Expert
LifeTime Supporter
Jul 7, 2014
15,415
Bedford, TX
ph,

Any idea why the Return valve (the one on the left in your pic) is in the position it is in???

Normally it would be one way or the other, not in the middle?

Jim R.
 

poolheat101

Member
Sep 29, 2017
8
Miami, FL
Just wanted to be sure we are all on the same page - you are adding large amounts of water to your system due to the spa level going down. Correct?
Correct.

- - - Updated - - -

ph,

Any idea why the Return valve (the one on the left in your pic) is in the position it is in???

Normally it would be one way or the other, not in the middle?

Jim R.
Spa returns. I think in that position (middle) you get some flow to the spa jets in pool mode to have the water spill over. In spa mode it moves to the right for full flow to the jets. Am assuming full left is no flow to the jets.
 

Jimrahbe

Mod Squad
TFP Expert
LifeTime Supporter
Jul 7, 2014
15,415
Bedford, TX
ph,

In the position the Return valve is in, if the check valve in the lower left of your picture is leaking, the Spa water will just flow back into your pool..

Thanks,

Jim R.