I've got the pool installers here doing a new liner install. The old liner (only 5 yrs old) is brittle and thin and he's telling me and my husband that it's due to us using liquid chlorine. We switched over to the TF method two and a half years ago and my pool water has never been cleaner. We used to have problems with algae at least once per season, which I discovered through this wonderful site was due to high CYA. Once I stopped using the pucks, lowered the CYA and use only liquid chlorine (12.5%), we've had crystal clear water w/no issues. Now my husband is worried about using the liquid chlorine. Chlorine is chlorine, no?