I recently got back into brewing after a 5 year hiatus, and noticed that my StarSan is a little darker in color than the stuff they sell at the LHBS. The guy at the LHBS said it can lose its potency, but should be fine. I used a little bit more than I would have (not much) if it was fresh, and everything seemed normal.
Has anybody here had to store StarSan for a long period of time (2-5 years)? And if so, how did it work out?