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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Raspberry Stout Infection?

I brewed a 5-gallon batch of Frankenberry Chocolate Raspberry Stout July 20 (11 days ago) using a Scottish Ale Wyeast. The yeast was pitched at 78 degrees, everything was sanitary, I immediately ...
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2answers
111 views

Should dry hopped beer be lightly stirred prior to bottling?

I'm making an IPA and I'm going to be dry hopping it this weekend in the secondary fermentation phase. I've been thinking about the dry hopping process alot, mainly about the diffusion of the ...
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2answers
82 views

Overflowing Airlock and Contamination

I use a Raspberry Pi with water-proof temperature probes to monitor the temperature of my fermenting wort, and I feed the probe through the airlock to make direct contact with the wort. Two out of my ...
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5answers
132 views

Did I just contaminate my beer?

I brewed my very first batch almost 4 weeks ago. I currently have my beer in a secondary fermenter (glass carboy) and plan on bottling in a couple days. I dry hopped it late last week. Today I got ...
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1answer
893 views

Is this lactobacillus?

My last batch had a thin whitish 'membrane' on top of it and some white spots, visible on the picture bellow. I think I saw something similar on a blog a while ago, attributed to a lactobacilus ...
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3answers
367 views

Preparing water for brew day

I'd just like to get some opinions on the most efficient way to prepare the water for my brew day. I'm pretty new to brewing and still using extract with a few specialty grains. I've read it's good ...
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2answers
468 views

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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3answers
180 views

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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2answers
738 views

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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1answer
2k views

How to identify a brett contamination

I brewed a single hop American pale ale with palisade. It's not the greatest beer in the world, but seemed passable to me. Another brewer tasted it and thought he picked up brett in it. Palmer ...
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1answer
868 views

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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2answers
233 views

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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1answer
364 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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2answers
227 views

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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2answers
2k views

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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5answers
1k views

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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3answers
523 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
2k 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
1k views

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
1k views

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
4k views

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
238 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
1k views

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 ...