Last year, we had a brand new liner installed in our unground pool. It looked great after installation and the duration of the time we swam in it last summer. I opened the pool this spring and discovered big wrinkles (4 of them) across the entire shallow end. They go from the pool steps all the way to the end of the shallow section.
I tested my pool chemical levels when I closed the pool last year. Everything was okay. I’ve been testing chemicals regularly as I worked to remove the algae.
What could have caused these wrinkles??
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