Hi again
The corners and edges being still in line is a good sign. With a 4 year old liner you'll want some sun to help keep the stretch in the liner as you adjust it and an air temp of 65*+. You also want there to be no water under the liner when you drain it!
Here's the new 'wrinkle' ( ) to my advice - if you're doing this prior to closing the pool, take the water down to the wrinkles (they CAN be moved with up to 2" of water on them) and then blow out the lines, add antifreeze and plug them with the water down - then fill the pool up to operational level or higher so that you have as much pool water as you can to keep the ground water from pushing the liner around! In the future, you'll do better to leave the pool water up when closing or refill the pool after the lines are cleared. If you need tips on closing a pool with the water is still up, they can be found by searching or, I'll just tell you (if you ask real nice )
What you really want to do is find a way to keep the ground water at bay so you don't have this problem every year! I'll be more than happy to suggest options, and I'm sure others here can and will help, but I'd need some details about your yard and topography,
I'm here most every day, so if you need some advice on the wrinkle removal, doing a 'no drain' closing or ground water control - all you need do is ask
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