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Elevated Spa Draining To Pool When Pump Is Off

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#1 TexasSwimmer



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Posted 25 March 2009 - 07:18 PM

My elevated in ground spa is draining into the pool when the filter pump is off. I replaced the jandy check valve which is typcally the cause of this however even with a new check valve, the problem continues. I have noticed that my DE filter does have a small leak at the pressure gauge however my thought was that any water that drains from the filter will get stopped by the check valve. What else can cause the water level in the spa to drain back into the pool?

#2 Pool Clown

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Posted 26 March 2009 - 04:57 AM

If you have valve actuators, One could be misaligned or have stopped working. Put the system into spa mode while you are at the equipment and see if both valve actuators are moving to the spa position.

Do you have an in floor cleaning system that is also in the spa? That system will have a check valve in addition to the one you replaced.

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#3 leakhelp



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Posted 27 March 2009 - 10:29 PM

Just like PC said...check all the valves. Basically anywhere the pool and spa can connect- through the suction lines (the valve located there could easily have something breaking the seal since it is unfiltered water flowing through this valve). Return lines and the related valves. If your spa has a dedicated "by-pass", there should be a check valve on that too. If this is foreign to you, take a picture of your equipment and maybe we can help further. Sometimes, if you go out to the pump at night (or anytime when it is quiet) and run it, shut it off and listen next to the valves- you may hear the water siphoning back and that will identify the bad seal. If all the valves check out, make sure you don't have an actual leak. You can do this several ways...try an evaporation test- it's cheap (basically free, just need a 5-gallon bucket and tape) and pretty accurate if done correctly.

#4 TexasSwimmer



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Posted 28 March 2009 - 02:25 PM

Thanks guys. I found the problem. The pressure valve that sits on top of the DE filter has a very slow leak. I initially did not think this would cause my spa to drain back into the pool however when I took a second look at all of the plumbing I realized that the return of water after the filter splits off (to send water to both the spa and pool) however the inline chlorinator AND check value are only on the line that goes to the pool.....water from the DE filter back to the spa does not pass through the chlorinator nor check value. Is this the usual set-up?

#5 AZMermaid


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Posted 28 March 2009 - 04:19 PM

The elevated spa probably does have at least one, possibly two return lines coming from the pool side. This is why when you have everything in "pool mode" you get an overflow from from spa to the pool. That is how the spa gets benefits of chemicals in the pool. So, it is highly likely the filter pressure relief leak was causing your problem. Without the seal the water as getting through the check valve, then doing what water does, seeking its lowest level, and going to the pool. When you are running in "spa mode" you are only circulating water from spa-to-spa, with no additional chemicals being added.

#6 lcgyy



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Posted 29 March 2009 - 06:18 PM

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