How to Know When Fermentation Has Finished

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Portrait of Emmet Leahy

Emmet Leahy is the Chief Operating Officer and lead product developer at Clawhammer Supply, a small scale distillation and brewing equipment company. He loves the process of developing new equipment for making beer at home just as much as he does using it to brew his own beer. He's also passionate about teaching people how to use distillation equipment to produce distilled water, essential oils, and with the proper permits, fuel alcohol and distilled spirits.

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96 Comments

  • TG
    Comment Author: Tim Guther

    Just a comment regarding questions about airlock not bubbling;
    A real fermenting bucket has a rubber/silicone bead ring built into the lid that makes a tight seal. When I started, I was using a bucket and lid from Tsc or home depot. Those lids seem tight when they snap on, but aren’t air tight.
    When I bought a couple of buckets from a brew shop i saw the sealing bead the light went on.
    I had always figured there was something wrong with my mash…

  • T
    Comment Author: TOny

    Been running a brown sugar mash with daddy yeast for 3 weeks now and am still getting bubbles every 20 seconds or so…

    Do I just let this keep running? I’ve never had it take this long to stop bubbling but want to make sure I get the best yield

  • A
    Comment Author: ALlicca

    Can someone please share A recipe for vodka everclear 120 proof I understand is needed to make sanitisers for our community please?
    I have vevor 9 gal still and many in need

  • G
    Comment Author: George

    My corn mash sat for 6 weeks. The seal and airlock were good but I couldn’t run after two due to travel. I noticed oil droplets on the top from I guess the corn. Is this mash still good to run?

  • W
    Comment Author: Ward

    Should your fruit mash taste like sugar. I put fleshmans
    Year in it but it stopped bubbling after two days and it tast real sweet