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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.
How to Replace a Vinyl Liner Inground Pool with a Fiberglass Pool By Marcus Sheridan, http://www.poolschool.us/ The inground swimming pool market has changed quite a bit in the last 20 years.