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Paying a little bit more for a liner that you'll never have to replace is worth it! Add the Horizon pool pad and cove kit to the liner purchase and the 100% Warranty will extend not only to seam separation but to any other failure of the liner due to manufacture defects.
Inground Pool Liners: The reality is that the average inground pool liner will last 5-12 years. I've seen many cases where inground pool liners have lasted less than 7 years and other cases where they've lasted almost 20 years.