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?


1 Answer 1


I'm still using the same 32oz bottle that I bought four and a half years ago with no problems. To check for potency of the made-up solution

  • ensure that the pH is below 3.5
  • check that there is still some foaming when shaken
  • pH should be 3 or lower. See here Apr 30, 2012 at 13:49
  • pH 3.5 is the limit - see here - a transcript of the Brewing Netowrk show featuring Charlie Talley of Five Star Chemicals, where he goes into some detail about what makes StarSan effective.
    – mdma
    Apr 30, 2012 at 14:21
  • Thanks! The stuff foamed wonderfully when I mixed it, so I am assuming it is still good. I'll get some litmus paper next time I am at the LHBS and test it for sure. Apr 30, 2012 at 14:41

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.