Fiberglass pool structural leak after accidentally unscrewing return wall fitting…

johnkim2020

Well-known member
Aug 2, 2020
80
Canada
Hi everyone

My l Leisure Pool ultimate 35 fiberglass with a built in spa. It is leaking and I’ve narrowed down it is at the spa after shutting pump off for 3 days , cover closed, spa plumbing isolated, and measured water level.

Result
1. Pool water no drop
2. Spa water dropped 6cm (2.3”)
3. Pump off, cover on, spa suction valve closed. Spa return valve closed

I highly suspect this has to do with what I did when I closed my pool this last winter:

1. I used duck plug w/o telflon and screwed in too tight. When I tried to unscrewed it to add teflon, I unscrewed the actual return wall fitting itself (see photo; the one with expansion black plug).
2. I was able to screw it back in with a channel lock but from what I’ve heard, you’re not suppose to be able to unscrew the wall fitting itself.
3. The spa was filled to the top at closing. The suspected return fitting is at the bottom. When I opened the pool this year, the water didn’t decline to the leak location which is puzzling.



What I’m doing next

1. I plug the suspected return with an expansion plug and marked the water level again to see if it lowers in 24 hours.


Meanwhile, any advice if this can be fixed without having to dig up the ground? Any advice for next step? I don’t want to accidentally do something to make it worse.
 

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The level the water stabilizes with a leak indicates where the leak is.

 
The level the water stabilizes with a leak indicates where the leak is.

Thanks.

I plugged both returns and waited 24 hours.

Water level didn’t go down.

When I unplugged the return of the suspected return, a glup of air came out versus nothing on the other return.

Now I’m leaving the suspect return line open and plugging the other line and see what’s next in 24 hours.

Lastly, do you know if wall fitting can be removed for fiberglass pool?

I asked ChatGPT and it told me that for fiberglass pool, wall fitting doesn’t use locknut behind the shell unlike vinyl pool. Instead, the wall fitting is threaded to an glued adapter.

I wonder if I should try to tighten it or unscrew it ?
 
I asked ChatGPT and it told me that for fiberglass pool, wall fitting doesn’t use locknut behind the shell unlike vinyl pool. Instead, the wall fitting is threaded to an glued adapter.
I don't think ChatGPT reliably knows what the installer did. Installer don't always follow standard methods.

And even if it was glued you don't know if the glue held.

Can you contact the Installer?