Florida has a layer of limestone. Limestone is very difficult to dig thru.
When we put in our pool, Broward County, we wanted it to be at least 7 feet deep so we could have a diving board.
The pool company explained to us that they hit a limestone ledge while attempting to dig the hole and made it to 5 1/2 feet.
They informed us it would cost big $$$ for them to dig thru the limestone, so we gave up the diving board and ended up with a 5.5 foot deep end.
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