I recently got a little beer brewing kit to use at home with a 4L fermentation bottle. Up until I filled the beer into the bottle I think I've done everything right, but since then I saw no sign of a fermentation process in the bottle whatsoever. I think I used a bit to little yeast. The color, consistency and the overall apperance of the beer have not changed at all and it's been like 10 days now. Is there any way I can save this "beer", for example if I open the fermentation bottle, fill in some yeast and close it again for a week or is this batch of "beer" completely lost?

Thanks in advance for your help.


  • 1
    This is better suited for Homebrewing. I have flagged for migration.
    Commented Jul 16, 2019 at 13:19
  • Thanks, I didn't know this existed.
    – s137
    Commented Jul 16, 2019 at 14:40
  • 1
    If you pitched the yeast when the wort was still hot, you may have killed the yeast. Re-pitching yeast at a lower temperature would cure that condition.
    – 42-
    Commented Aug 4, 2019 at 19:48

1 Answer 1


Sometimes (rarely and with low gravity table beer) I see very little signs of fermentation. Just a thin layer of krausen on top. The only way to really know if fermentation has started/finished is to test the gravity to see if any of the sugars have been converted by the yeast you used. If this test shows that the gravity is the same as the starting gravity, then you could pitch a new batch of yeast, appropriately sized for your volume and gravity of wort. If the test shows that the yeast have begun eating the sugars but the beer has not reached final gravity, I would wait a bit to give the yeast a chance to attenuate fully. If subsequent gravity readings indicate a stalled fermentation, then I would advise you to search this site for "Stalled Fermentation" There are many good answers here on how to deal with this issue.

  • Sometimes if you use too much fermentables, it stresses the yeast slows the fermentation. What you could do is pitch of some more yeast, and it should start the fermentation process again. And more than likely it will raise your final gravity / alcohol by volume. Commented Dec 24, 2019 at 20:49

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