The introduction of unwanted organisms or chemicals into the beer. Typically, this refers to unwanted bacteria or wild yeast propagating to levels to cause spoilage of the beer. Often incorrectly called an "infection".

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does starsan kill yeast

Is Starsan effective against yeast? After resuming homebrewing again after a 2 year break, I started having pellicle appearing on my starters (after fermentation had completed), which has now spread ...
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1answer
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Possibly infected mead: is it worth keeping?

I tried making cherry mead again (the first time I tried this it got infected). I tried again yesterday, and it looks like I've got some sort of contamination ("infection"). This time I thought that ...
6
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1answer
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Cherry vinegar (was supposed to be mead)

Last week I started a cherry mead and discovered yesterday that it had turned to vinegar (and not even nice-tasting cherry-flavoured vinegar - it smelled and tasted awful, though the colour was ...
7
votes
4answers
2k views

Can a contaminted brew be identified by sight?

I brew ten-gallon batches of beer split into two fermentors. The last batch that I kegged had one infected fermentor, while one remained uninfected. One bucket showed a white powdery substance ...
9
votes
5answers
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What prevents contamination during primary fermentation?

I'm about to start my first beer and I've been doing lots of research.. but a question I haven't seen answered is why isn't there more contamination during primary fermentation. For secondary the ...
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4answers
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What is this white stuff on the surface of my beer?

I've just gone to rack & bottle a witbier that has been in primary for about 5 weeks and noticed this white gunk floating on top of the beer. It doesn't look too healthy, what is it? Is it safe? ...
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votes
3answers
669 views

wild yeast taking over?

I brewed a belgian triple last week. I had a starter going using white labs trapist yeast but it didn't take off, must have been a bad vial. In the meantime the batch was sitting in the carboy ...
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1answer
3k views

What is the white film on my beer in my bottles?

I brewed a double batch of IPA with a buddy about 8 weeks ago. We split this into two 5 gallon pails and 2 weeks later into two carboys. His was fine, but mine developed a bit of white stuff on ...
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4answers
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How to add adjuncts (hops, fruit, spices, etc) to the fermenter without contaminating the beer?

What is the best way to sterilize things like dry hops, spices or fruit before putting them in the fermenter? Some stuff you can obviously boil. But boiling hops, say, would defeat the purpose of ...
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5answers
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Help! My secondary fermenter exploded!

So, I was brewing a nice IPA the other day. I walked in to check on the carboy and the stopper had popped out and there were hops everywhere! I stopped it back up and bottled it a few days later ...
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5answers
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What is on top of my wort? Mold? Lacto?

I just opened the top of my scotch ale bucket, and it looks like there's mold inside. The recipe is pretty standard, plus some oak chips soaked in whiskey, in a muslin bag. What is this? Edit: Some ...
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3answers
251 views

What about opened LME cans?

Most LME come in 3 pound cans, which is a quite large quantity if you want to add just a little to your wort, just one pound for example. It's a shame to throw away the rest. If I open a LME can and ...
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10answers
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Spigots: What's the consensus

I like to use an ale pail with a spigot for my secondary. It makes it super easy to test the gravity before actually bottling/kegging/etc. However, that sort of installation in plastic can open the ...