So just wanted to share this - it's come up relatively often - the issue of 'does liquid chlorine aka bleach, cause your liner to fade'. The consensus has been no. I think I discovered a sort of "evidence" of this in my 13 year old pool.
Has my liner faded? Yes. I've used liquid as my primary chlorine source for 7 years now. However, the fading was there prior to the switch. What I discovered is under the ladder pad, I can still make out the pattern - so this would suggest to me the sun is the culprit - if it were caused by the use of liquid the liner pattern under the ladder pad would also have faded, wouldn't you agree?
Take a look (ignore the dirt, pre-vaccum...)
20140511_083859-1 by poolmom11, on Flickr