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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Possible contamination / small areas of bubble clusters on top of brew

How would you know if your brew is or isn't contaminated? I'm the first timer that dealt with the broken spigot & had to transfer at 6 days. Just hearing about contaminated home brew so many times ...
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How worried should I be about a plastic-wrapped kettle that had to air chill for two days?

I was in the middle of a 7-gallon brew, when my landlord informed me that the grain that I had put down my garbage disposal had clogged the main drain for the house. My sink is too small for an ice ...
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Is my batch contaminated / infected?

Me again with another question. So there's not been much activity from my brew lately (no bubbling, only 3rd day in the fermenter). I opened up to take the gravity and temperature (1022, 21C), so it ...
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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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Is iodophor ideal for rinse-less sanitization before bottling?

I was talking to a friend today and complainIng about the clean/bleach/sanitize/rinse process I undergo when bottling. He dug a bottle of iodophor out of a back shelf and asked me to try it out. He ...
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New brewer, question about state of beer prior to bottling

Tomorrow is the Big Bottling Day. I snuck a peek about a week ago and took a hydro reading, and all is well I believe. I took another peek today (14 days in) just to make sure I'm not about to bottle ...
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480 views

contamination? what's this?

I brewed a hoppy red ale on Tuesday and pitched some washed wyeast 1084 into it that evening. I had an og of 1.070 and went ahead and put a blowoff tube on the fermenting bucket in case I had a huge ...
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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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2answers
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Mold on wort pre-pitch

I've got a bit of mold on top of my wort. My situation is a bit different than what others seem to have encountered... I made the wort about 5 days ago and hadn't gotten around to pitching the ...
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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
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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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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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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 ...