I brewed and subsequently bottled 2 batches of beer together, following much the same process for cleaning/sanitizing and brewing throughout. When bottling, I bulk primed both batches with a sugar solution split between them.

Having bottled both batches, one has come out fine with all bottles carbonated, but the other has about half the bottles with no activity.

I suspect the yeast might have died in that latter batch, or an oxygenation problem, but am seeking clarification and suggestions. The flat beer smells and tastes ok, it just hasn't carbonated.

2 Answers 2


If the latter batch had about half of the bottles uncarbonated like you mentioned "but the other has about half the bottles with no activity" then it sounds like the sugar solution and beer did not get mixed thoroughly and therefore the ones that didnt have enough of the sugar solution did not carbonate. To avoid this I put the sugar solution in my bottling bucket and then rack onto it also stirring lightly with the racking cane before bottling.

  • I second this answer and recommend placing the sugar solution into the bottling bucket and then racking onto it also.
    – Dan
    Commented Feb 6, 2011 at 14:48
  • That's a good point. I bulk primed both batches in their respective fermenters and left them for 30 minutes before bottling directly, so maybe the sugar didn't mix through. That could be good news as I could add some priming sugar into the flat bottles to possibly get them going again. Thanks!
    – Rog
    Commented Feb 7, 2011 at 4:05

I agree with the other folks that you have to put your priming sugar in the bottling bucked prior to racking the beer over. Another thing to consider, though - any chance you boiled your bottle caps to sanitize them? If so, you may have damaged the seals which could explain your lack of carbonation.

  • I'm using PET plastic bottles and the seals seem to be good. Good suggestion though, thanks!
    – Rog
    Commented Feb 8, 2011 at 23:35

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