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The water under the liner is either from a high water table in your area or spring thaws and rains which are having trouble draining through the soil. Adding more water to the pool will help push the ground water down and it should eventually recede on it's own. As the water leaves , you can use your pool brush to help keep wrinkles from forming - it's a slow process, but - if you're diligent, it should keep large wrinkles from forming.
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