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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.
Simply stated, a vinyl liner swimming pool is a short-term solution to a long term investment. Although its initial cost is normally $5,000-$10,000 less than a fiberglass or concrete pool, its long-term cost is often much more.