Bubbles from crack in spa gunite

GmorningGunite

New member
Aug 22, 2021
4
Pennsylvania
I purchased a house with saltwater pool and elevated spa a couple years ago. While recently in the spa, I noticed small bubbles coming from a gunite crack at the bench which was previously patched by the old owners. Video at
Pictures of whole area:
The bubbles continued even after we turned off the pump. I haven’t seen it happen since, but also haven’t used the spa again.

Any idea what could cause this?

And what I can do to address it in the short or long term? Will resealing the crack work, or would it just mask a bigger problem?

Tying anything major to resurfacing in 5 or so years would be ideal if possible.

There are a couple other patched spots without apparent leaking/bubbling. The previous owner also had a leaking skimmer-gunite interface that lost a couple inches a day and is currently watertight with epoxy. How long they left it like that I’m not sure (they’d been unable to diagnose), but I can be sure significant water was getting into the raised concrete structure at some point.
There are occasionally bubbles at the return jets in case that matters...

Thanks for any help!
 
Last edited:
Cause: unknown until the plaster area is exposed and possibly exposing some of the Gunite below the surface.
Short term: using an epoxy to patch the crack that’s allowing the air to escape will most likely cause the air to move to another weak spot in the plaster.
Long term: draining the spa, removing the plaster and Gunite until the source is found, most likely in a plumbing line in that general area.
 
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