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

  • J
    Comment Author: jason

    ottawa canada

    im did a double batch of the rebel rum recipe from this website, (with a few secret adds), and pitched it with 1 pack per carboy Lavlin ec 1118 yeast – its been bubbling for 21 days straight, in a 70 celcius room. first 14 days it bubbled 21 times per minutes, then slowed to half that. if you raise the temp in the room to 5-10 degrees it will speed up the process – but the yeast i used was 18%abv which is also high so its taking longer than normal. as longs as its bubbling…let it bubble…until it stops. like the joe dirt movie, “He’ll finish when he’s done dear”.

  • JM
    Comment Author: John mastaglia

    Gday guys I live in Perth Western Australia and the temperturehere in summer is on average 37 degrees cellcus I just did my first ever mash a simple sugar shine using turbo yeast (it was recomended to me by the brew shop) I pitch the yeast at 30 degrees but today’s temp has been 39 degrees I have managed to keep the mashes temp down too 34 degrees will this result in a bad was

  • PL
    Comment Author: Pat Leary

    My mix is in a 5gal water cooler.I place 4 to 6 inches of whole corn,10 lbs of sugar and 6 pks of yeast.Fill container with water.mix well and allow to seat for 30 to 40 days.At that time there is no more activity.The final product produces 1 quart and a 5th of good moonshine.The proof is always a 100 proof.

  • J
    Comment Author: justin

    I am new to the whole home brewing community. being this is my first time to do a run, I am making 2 different 1 gallon batches. I used the same amount of pre distilled water, bread yeast, and sugar in both. the difference is one has strawberrys and pineapple the other is just sugar. my concern is the one with fruit has stopped as far as any activity (in the airlock, or any small foaming/bubbling) and the sugar one is still going strong {bubble the airlock once every 3 seconds or so}. at this point they have both been going now for 4 days. any advice or insight would be greatly appreciated.

  • P
    Comment Author: Popav

    Is it necessary to use thump keg