If your pool has leaked out over the winter or you have pumped it down, it is best to keep it covered. This keeps the liner out of the sun as well as keeps rodents from eating through your pool liner. Pictured left is a liner that was shredded by a rodent. This pool was in need of a new liner and a makeover.
This particular liner was not that old, however the customer choose to pump the water out to do repairs. The liner shrunk in the sun and when he tried to refill it, it ripped because of the tremendous stress on the liner that is now too small for the pool.