I keep hearing that this level or that of free chlorine will fade vinyl liners. Similarly, that pH below X will cause liners to become brittle. Unfortunately, these statements are always rather imprecise and based on anecdotes or what someone told someon else . My guess is that with CYA in the water, liner fading from chlorine is probably much less of a problem than many make it out to be. I don't know about pH.
It think with some fairly simple experimentation it would be easy enough to come up with some rough guidelines, at least for chlorine. To do that though, I'd need some small pieces of liner or a good proxy. The internet hasn't turned up any sources for the vinyl. I haven't checked the local pool stores yet. Any other ideas on where to get some liner samples? Any suggestions on experiment design would also be welcome.