Need help! Spa draining to pool level despite new check valve

Mauser4me

Member
Dec 11, 2024
10
Houston
Bought a home with my first pool (and did not grow up with one so have zero pool ownership experience) about 3 months ago. As long as I have owned the house, the spa has been draining down to pool level, which in the photo is about the bottom of the tiled perimeter (which is above the spa jet level) in the evening when the pump shuts off. Then, in the morning when the pump turns on, the autofill is back up and running basically the entire day until evening. I am constantly running the autofill and want to get to the bottom of it! One thing I have learned is that the previous owner did not maintain anything at all with the pool equipment. The heater does not work for whatever that is worth.

What I feel are unrelated fixes I have done to the equipment (listing for elimination of possible issues?):
1. There was a leaky actuator (the one with moss underneath it in the photo) which I had the o-ring replaced on (this is because it had a slight leak). It also needed to be adjusted as is was not turning perpendicular to the flow when triggered.
2. new o-ring in the chlorinator
3. New cartridge filters
4. New boost pump (old one died)

I had the spa check valve replaced by a pool service company when I got the house since it was totally shot, and was not surprised that it was draining. Unfortunately the replacement check valve didn't fix the issue. However, after the check valve was replaced this first time, the spa was only draining about 2.5 inches each night, which is better than the full ~6 inches to pool level/bottom of the tiles. I was told by the pool service company I hired that the 2.5 inches of drainage was normal as water 'settled into the pipes' after the pump shut off. I have since read that that is nonesense. Of note, when the pump was off, the check valve 'door' was opening just slightly and closing again, over and over. When this happened, the ball bearing in the chlorinator would jump and make a small 'clicking noise'. I thought that that meant the valve is still bad, so I had them replace it again. This time, the valve may as well not be there as the spa now drains all the way down to pool/bottom of tile/~6 inches as it did when the original shot out valve was in. When I called the service company again, the owner came out to speak with me as his thought was now that the check valve was not the issue. He observed the check valve flapping open when the pump is shut off and said that there is 'pull' coming from the pool side of the check valve. He said he had never seen this issue before, and long story short I am on my own as he didn't know what to do. He recommended replacing the chlorinator o-ring again, but as it is brand new and the issue existing well before the current replacement, I don't think that would be any issue. The chlorinator has water in it when I open it to put tabs in. I told him what I was paying in water every month and he said if I had a pool leak, the cost would be much much more. He said I could also manually kill the autofill each night, or electrical tape over the pool overflow. That's when I realized I needed to get advice somewhere else. The pool level does not go up over into the overflow grate (shown in photo 4).

I have googled 'typical pool & spa plumbing diagrams' to try and sketch out what exactly is happening so I can speak intelligently on this but can't yet wrap my mind around how all of this works. Again I am quite new to all this, but really want to stop filling my pool all day every day.

Advice would be very much appreciated!! Also, if anyone knows any pool companies serving the north Houston/Spring area that would be great as well! I would like to diagnose the issue myself if possible, but have someone in my back pocket to do the repair if it is beyond my skills to do so.
 

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M,

Did they replace the whole check valve or just the guts??

If just the guts, it may not be the right one, or there may be glue in the area where the flapper seals the pipe.

It is not always the check valve, but it is about 90% of the time. :mrgreen:

As a test... When you turn off the system tonight, turn the valve, that is just to the left of the check valve, so that the 'off tab' points up. This will shut off any water from flowing through the check valve. If your spa no longer drains down, then check valve is bad.

Thanks,

Jim R.
 
Fwiw, though the check valve is the likeliest root cause, the other way the spa can drain is through the 3-way valve on the suction side of the pump. Iiuc, you're saying the check valve is passing a little water on the return side from the spa toward the filter? If so, the 3-way may be the problem. That valve can leak if the controller is broken or (more probably) misadjusted so the diverter stops with the spa side "cracked" a bit. Or the diverter seal can go bad, though that doesn't seem to happen often. Both problems are pretty easy to troubleshoot and repair. The manuals for the valve and actuator have all the info. A new OEM diverter is about $50, and adjusting the micro switches that determine the stopping positions is a no-parts job. Good luck with it.
 
M,

Did they replace the whole check valve or just the guts??

If just the guts, it may not be the right one, or there may be glue in the area where the flapper seals the pipe.

It is not always the check valve, but it is about 90% of the time. :mrgreen:

As a test... When you turn off the system tonight, turn the valve, that is just to the left of the check valve, so that the 'off tab' points up. This will shut off any water from flowing through the check valve. If your spa no longer drains down, then check valve is bad.

Thanks,

Jim R.
The pool company owner did do that test, and the valve did stop letting water through. When you say the check valve 'guts' - what they replaced was the clear cover and the door; the black plastic 'body' of the check valve was not replaced. Is that what you mean by the 'whole check valve'?
 
Fwiw, though the check valve is the likeliest root cause, the other way the spa can drain is through the 3-way valve on the suction side of the pump. Iiuc, you're saying the check valve is passing a little water on the return side from the spa toward the filter? If so, the 3-way may be the problem. That valve can leak if the controller is broken or (more probably) misadjusted so the diverter stops with the spa side "cracked" a bit. Or the diverter seal can go bad, though that doesn't seem to happen often. Both problems are pretty easy to troubleshoot and repair. The manuals for the valve and actuator have all the info. A new OEM diverter is about $50, and adjusting the micro switches that determine the stopping positions is a no-parts job. Good luck with it.
I am not sure what pipes are supposed to flow which way just yet to be honest. If I had a diagram of the pool plumbing I could understand it, but until then I am working off of what I was told. Either way, I am more than happy to get cheaper parts replaced/calibrated
 
At this point what I am thinking is to have the 'entire' check valve replaced, housing and all? If that does not fix it, then I could have all of the actuating valves serviced and inspected. Would that eliminate the potential causes mentioned so far?
 
M,

If this were my pool, I would remove the check valve 'guts" (Cover and Flapper) and see if any glue from the original installation, is in the area where the flapper seals the pipe.. If not, then having the entire check valve replaced is what I would do. If there is glue, you can sand it away, reassemble the check valve, and see what happens. Note.. removing the check valve will allow spa water to drain out through the open valve body.. Just something to expect and will only be for a short period of time as the spa drains down.. Obviously, this is done with the pump off.. :)

I am not sure what your pool guy is thinking... :scratch: If the spa does not drain down with the manual Jandy valve turned to shut off the pipe going to the Spa jets, then the check valve is bad.. The check valve allows water to flow into the spa, and prevents water from flowing backward out of the spa. Turning the manual Jandy valve, shuts off the flow, which is identical to what the check valve should be doing....

If the Spa drained down, with the Jandy valve closed, then I would suspect a leaking Intake diverter valve.

Thanks,

Jim R.
 
Have gotten excellent responses from you guys and am glad to have the input! Jimrahbe drew me a diagram which is really helping me understand my system alot more. I had envisioned a completely different flow through the system. I am going to inspect the check valve again and then possibly service the intake valve.

Again can't thank you guys enough. Was loosing sleep when the valve was replaced a second time and saw it draining again.
 
Well I had the pool service company come out again and explained my new understanding based on the feedback I got here. They agreed that the check valve must be the issue. The two techs came out agreed that the owner of the franchise who came out wasn't getting it. They took out the check valve 'guts', lubricated it, and reinstalled and it seemed to work great! We looked for any old glue that may have been breaking the seal, and there was none. The pump runs 8am-4pm, and the latest I have been out to check the spa level is 11:30pm and it had drained just about 1 inch, which is the best the check valve has performed since I have owned the house. I don't really understand how lubrication would change the performance so much.

They said if I still was not satisfied there are a few other options:
1. Get a new check valve body/entire assembly
2. Replace my pentair check valve with a jandy one
3. Install spa jet check valves (the cheapest option of the three)

Thoughts? Again thanks so much for the input and letting me be able to speak with some confidence on this stuff now. I am learning quite a bit!
 

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If you ever decide to switch to a variable speed pump - highly recommended here - you can keep it running at a gentle rate 24x7, then this problem just never happens even if the valve is leaky. :cool:
 
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