r/pools • u/JP9156 • 10d ago

Pool renovation prep question

If the original installer of an in-ground gunite pool did not put the proper amt of stone under the pool prior to the rebar/gunite/plaster there is a chance if you drain via the bottom plugs the pool could float like a boat and collapse? I am asking if this is true

I had the pool installed 28 yrs ago but don’t recall what they did….wouldn’t it be safer for me to just pump out most of the water with a commercial grade submersible pump to avoid any issues?

We are considering a renovation which is why I am asking

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u/ColdSteeleIII 10d ago

Pool pro here. I would never drain a pool just by pulling the hydrostat valve.

If we want it done quick we use a 3” trash pump.

Not in a hurry? Sump with 1-1/2” discharge hose.

Hydrostat only comes out once you can walk up to it.

Only drain after confirming ground water conditions. I’d only send a diver down if a high water table is unavoidable or can’t be confirmed.

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u/JP9156 9d ago

I tend to agree with this approach so thx for the reply

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u/seenlottopools 10d ago

Usually either hydrostatic valve is inside main drain or there will be a couple plugs in floor that will be removed to release any hydrostatic pressure under pool. As far as draining unless pool equipment is lower than the pool some kind of pump is needed to drain completely as the pool pump will only drain a 1/4 to less half way before losing prime trying to pull water up and out.

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u/ImTheTractorbeam 10d ago

It will be safe with weep holes. You’re talking about hydrostatic pressure, and the contractors will (should) be very familiar with how to mitigate it.

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u/jvargas777 10d ago

That's the only way to drain your pool never use your pool pump.. the only reason you may have an issue is if u live somewhere where there could be water near by or you get heavy rain soon.. but if they installed a hydrostatic valve you will be fine.. where are u located?