Welcome to the forum!
It's easy enough to install a hydrostat in a vermiculite pool - all you have to do is put in a main drain pot.
However, I'm not sure that the hydrostats are the best way to go. I think a well point with an automatic pump would be a better option, especially if the builder laid down gravel when the pool was built.
Do you know if it's ground water or surface water? Also, do you have somewhere to redirect the water to?
I'm more than happy to bounce possible solutions around with you so that you won't have to worry about the liner floating every spring!![]()
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