We've had our pool for 4+ years now. Something strange is happening this summer, though.
The liner is faded badly, but only right along one seam on the liner. So if it was from the sun or from dumping chlorine in, etc. I wouldn't expect it to fade perfectly right along one seam. I have to believe it has something to do with the manufacture of the liner that somehow the color is faded on that particular strip of vinyl.
Any ideas? I forgot my phone at home today or else I'd post a picture as well.