jharperweb, We had it for 8 years. Grandson poked 23 holes with a little leaf rake, he used it as a cane. I was doing landscape around the pool could hear him, grandma, this and that but didn't see what he was playing with.. Husband patched it held for a long time. At the end of the summer 19 it looked like it was getting stretch marks (little bitty) holes. We had it installed by a pool company, he was awesome 25 years in business. Honestly, I was scared to death it went from 78 degrees and sunny to snow then cool weather 56 and sunny within a week's time. We DIY everything, handing this over was a tough one but so happy we did. I love my pool! and TFP!