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I have 45 mil liner, butyl, and it withstood numerous tree limbs smashing into the pond during hurricanes last August/September. Flagstones broke under the branches that fell, but the liner held up. I have had 30mil in the past on a lily pond. After 10 years it began to lose elasticity and easily developed holes. But for 7 or 8 years, it was fine. Biggest issue with liners is catching waste in folds, and having unstable edges.
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