Draining a vinyl liner, not a great idea

Keep in mind that if you ever find the need to drain the pool, then it should be done in the coolest weather possible (winter months or evenings), it should be done quickly (drain it out as quick as possible), and it should be refilled as quickly as possible. But even with these intelligent measures, you can still run the risk of ruining your liner. A tale tell sign that your liner has shrunk will be that you will see the liner has moved away from the wall of the pool, meaning if you tried to push the liner back up against the side of the wall, then it would be very far off of the wall. Another sign is that the floor of the pool will begin to have arched wrinkle running parallel with the wall of the pool. This is because the vinyl is shrinking and sliding into the center of the pool and this is how the arched wrinkles in the floor get created.