Dream-ItDesign

WHAT GAUGE/MIL SHOULD I USE FOR OUR ABOVE GROUND POOL? We purchased a 20 mil pool liner to replace our old one. We just received it and it is MUCH thinner than the old one. I'm not sure what gauge/mil the old one was but it is much thicker and lasted us 8 years. Should we send this 20 mil liner back and get something thicker? Seems a lot of companies are selling 20 mil but we'd prefer to spend a little more and do it right so it lasts as long as possible. Suggestions???? Thank you for your time!