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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?

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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
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  • pH should be 3 or lower. See here
    – FishesCycle
    Commented 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
    Commented 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.
    – Ben Belchak
    Commented Apr 30, 2012 at 14:41

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