Professur said:Do you winterize the pool at all? Here, the pumps are pulled, drained and filled with antifreeze (plumbers) to prevent the seals from drying out. The hoses drained, and if they can't be pulled, they're antifreezed as well, and a dozen or so 2L soda bottles get chucked into the half drained pool to protect it agains frost heave.
When foundations are designed they are designed to sit below the frost line to prevent against frost heave.