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A pool liner can last anywhere from 15 to 20 years, depending on your pool’s chemistry. If you keep your water balanced, your liner will last longer than if you don’t. For example, over-chlorination, too much sanitizer, and heavy metal buildup can contribute to a shorter lifespan.

It’s always best to start fresh rather than put a new pool liner over the old one. You will need to redo or re-groom the bottom of the pool base before installation anyway, so many homeowners choose to get rid of the old one and start anew.

If you’re simply dealing with a small tear or leak, it’s completely feasible to patch the old pool liner rather than replace it. However, if there’s major damage, patching will be a waste of time and money, and you’ll be better off replacing the entire liner.