I've searched the forum for this info. But can't seem to locate. I'm replacing my pool liner and wondering if there's a concensus of what level (ppm) of chlorine to keep in the pool so as not to degrade the liner? I have managed to bleach my liner out completely by maintaining levels in the 5-7ppm range over the past several years after switching to the TFP method. Of course this also included various and sometimes lengthy shock sessions when I was first getting started I'm hoping to avoid turning my liner completely white this go round. Is there a certain level not to exceed? I understand the relationship between FC and CYA. I would prefer to allow my FC level to dictate my CYA level rather than the other way around. Sadly my liner is still in good condition. I'm only replacing for aesthetic reasons. I also have a hunch that my FC levels may have possibly led to pipe/valve degradation as well as I am also having a series of leaks repaired.