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Don't I have the same possible issue though? Base material on the slab that does extend all the way to the pool deck.. ie 16 ft deep.... 12 ft is slab (10" below final grade), 4 ft is earth 10-ish " below grade). That's where I worry about the wash out.. from the water run off of the hard slab thru the base .
The Geo may bridge the gaps..
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