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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.
Find a Pool Liner Pro. Vinyl liners for in-ground pools tend to last 8 to 12 years, on average, although some might require replacement after just 5 years and others will make it to 15 or 20. For above-ground pools, which are more exposed, plan on 6 to 10 years.