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I just experienced my second liner failure in 8 years, so I’m wondering if anyone has any suggestions on things to check. I’m in northeast US with freezing winters. Back in winter 2018 we had a thaw and next thing I knew there was sand and water in the back yard. The liner was 5 years old. The...

Thank you all for all the info you've given me, and thanks for convincing me to switch from biguanides before last year. On chlorine now, 2nd full season. I'm a new poster and sorry to create a new post similar to what's been out there before, but I'm just stumped. FC 4.0 CC 0 PH 7.2 TA 90 CH...