Replacing a pool liner is a highly technical skill that's part science, part art. It's easy to measure a pool; knowing what to do with those measurements is considerably more difficult.
A good pool service contractor can make sure your pool's liner has the best possible fit, without a single wrinkle. Liners come in a variety of thicknesses, from 20 "mils" to 40. You can also check online to find out about Long Island swimming pool liner replacements.
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Generally speaking, most pools don't need a really thick liner; the standard gauge is 20 mils, and your pool probably doesn't need anything thicker than that. Most liners last about 10 years – sometimes as many as 12 — and probably won't last any longer or develop fewer leaks if they're thicker.
The manufacturing process is the same for every gauge of the liner, and warranties are the same as well. Pool liners also come in a variety of colors and patterns.
Be sure to choose a contractor who knows what he's doing when he installs your liner. Make sure he knows how to install your liner over the steps in your pool. You don't want the liner separating from the steps.
You'll also want to make sure your contractor has a broad variety of liners you can choose from. Ask two questions of your contractor: First, find out how long the installation will take; it shouldn't take more than about three days. Then, ask if there's an option to purchase an extended warranty.