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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.
The vinyl liner in an above-ground swimming pool, or an in-ground vinyl liner pool, will not last forever. The recommended lifetime for this pool component is usually set by the manufacturer and given with optimal conditions for chemical use, activity, sun damage and damage due to weather conditions.