[392cobra]

I would think that the pressure from our clay soil expanding/contracting without water in the pool to counter act those forces could lead to cracking.

The best bet would be to get expert advise from a Pool Co..They could also help with any ideas on winter care.

Pools are expensive.If not taken proper care of,year round,they can become a nightmare.

I grew up taking care of my folk's pool.I had my fill of them.