Well, looks like I am revisiting this topic again this year. We are on our 4th liner in 5 years (this one was put in new at closing last year). I have been battling pin-holes all season long and just got through patching about 6 today. We have noticed alot of bugs such as ants, centipedes and an occasional blue tailed lizard finding its way under the pool through the same access spot in the dirt. I assume these critters are eating their way through the happy bottom pad and the pool liner. What can we do to keep them from doing this in the future? We thought about building up a small retaining wall and filling it in with some dirt and gravel and putting alot of Sevin dust and/or Diazinon. I can't imagine people who live in the country and have an above ground pool have this problem? We thought we were doing it right the last liner we put in by hiring a professional, but it seems the same problems persist, so its not an installer problem. Thanks for the input.