Questions tagged [contamination]

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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1answer
29 views

Will taking the top off my vessel on day 9 spoil my brew?

I’m on day 9 of my home brew and the top has been taken off for about 5 seconds. Reading up on the CO2 layer that the yeast creates in wort and that exposure to oxygen can spoil your beer, I fear my ...
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ABV question in 5 gallon melomel batch

I started a melomel batch two weeks ago. Below are a list of batch details: 5 gallon batch frozen blueberries (roughly 4-5lbs per gallon) 18.5 lbs of honey (raw, unpasteurized honey from my fathers ...
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1answer
58 views

Possible contamination or mold?

Our marshmallow porter seems to have some type or mold or sediment floating atop the beer after 17 days fermenting in a wide-mouth plastic carboy. They look like flakes. Not fuzzy or spider-web like. ...
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42 views

Mead contamination?

I made a second batch of honey mead, O.G. 1.112 and after 2 weeks specific gravity was at 1.000. At this time I racked it into a glass carboy with cork and airlock. After 1 month I re-racked into ...
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1answer
137 views

What infection do I have and is it salvagable?

This is my first time posting to this forum, so if I make some edict mistakes I apologize in advance. I have brewed this recipe, https://www.homebrewersassociation.org/homebrew-recipe/beer-recipe-of-...
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1answer
63 views

Toxic compounds, weirder situation then usual, much weirder

Ok so I'm making some hard alcohol from a sugar-wash. I used too little yeast and fermentation ended up halting at like 7% ABV, it then stood around for like a week and a half till I got the new yeast....
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27 views

Last stage before bottling. Film appeared around top edge on glass and a few bubbles on surface

My batch of wine has been stabilized, degassed, and clarified. It is in the last stage before bottling and a film has appeared on the top at the edge on the glass. Also, there are a few bubbles on the ...
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1answer
196 views

Didn't reach expected FG. Should I postpone bottling? Also: It looks weird!

I'm a newbie brewer currently trying his luck with an irish red ale kit. I've followed the instructions (which weren't complicated since it's a kit), and I've let it brew for about 6 days now (...
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2answers
397 views

Is my beer infected? from an amateur. Posted a picture

I used only DME and hops to boil the wort. Added dry yeast directly. I looked up on the internet for similar pictures but couldn't find any. I know every beer ferments differently. So I thought I ...
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1answer
72 views

FG is 10 points under expected. Contamination?

I brewed an Imperial Stout and was aiming 1.099, but got 1.090 OG (By adding 1 pound of DME) After 13 days, my FG was 1.022 which was exactly my target. 5 months later, I took a reading and got 1.012....
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74 views

Strands Like Hair in Fermenting Beer

I am brewing a schwarzbier using US-05 because I don't have a setup to brew a real lager. The OG was 1.047 and I have a current gravity reading of 1.012 after 5 days of decent fermentation at an ...
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67 views

Suggestions on how to deal with infection?

When I was about to leave this morning, I noticed that one of my carboys has this white mold growing on the surface. In 8 years of homebrewing, this is the first time it happens. This is a braggot I'...
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2answers
226 views

Fruit flies in airlock led to contamination

I have some mead and cider going, and left for a month. When I returned there was a layer of white mold that ive heard referred to as air mold. I think it is because fruit flies got in the airlock and ...
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1answer
103 views

Contaminated batch - what went wrong?

After a number of successful brews, I think I finally have a contaminated batch. I've always been good about sanitation (or so I thought) but I've steadily progressed from paranoid germophobe to a ...
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2answers
167 views

Can I distill contaminated wine?

15 days ago I started a batch of wine from a Wine Kit. I went to measure the SG to begin the next step when I found the wine had a film layer at the top. Anyway I phoned the place that sold it to me ...
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230 views

How can I make maple bacon mead?

I never made a beverage with meat in it so I'm a little scared. I think I can bake the bacon to make it crispy, then crumble it into the mead. Will it be safe to sit for a month of fermenting? Is that ...
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3answers
108 views

Beer attenuates too much too fast

I am brewing with fermentis S-04 and from experience (three years ago) I know that this yeast is slow. This weekend I brewed a small batch and today the attenuation is 83% (according to the yeast's ...
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2answers
631 views

Beer attenuation too high

I have made ~30 batches of beer during last winter and ~7% ABV beer had FG of 1.010 to 1.020. But in the last month the weather got warmer and my beer FG has dropped to below 1.010 to almost 1.000. ...
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5answers
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How clean does your equipment really need to be?

For example has anyone done an experiment where they either didn't wash/sterilise any equipment including the fermenter, spoon, jugs, other etc or at most they just rinsed out the equipment with water....
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707 views

Beer's susceptibility to contamination over time?

I'm curious if anyone has any information about beers susceptibility to infection over time/stages of fermentation? My understanding is than beer becomes less susceptible over time but I specifically ...
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1answer
223 views

Kombucha has dark, green grey dust/moss inside liquid

Some of my kombuchas form a strange, greenish-grey powdery substance inside them. This looks like moss or dust, and appears embedded in the transparent matrices of strands inside the liquid, although ...
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3answers
152 views

Contamination from airlock

Long story short...I didn't have Vodka so had to use distilled water in the airlock. Life got in the way and over a week later I finally got back to the beer today. Fermentation has completed but the ...
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2answers
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What lab equipment could be used to effectively ensure a quality home brew?

For example how could you identify toxins in the simplest manner? I've got a few ideas such as microscopes and spectrometers. A microscope could be used to look at the morphological structure of what ...
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1answer
271 views

What are these insects in my malt?

Bought a bag of malt yesterday at the local homebrew store, and when I opened it today I noticed dark gray to blackish insects in there. I had some unmalted wheat in there with the malts. The store ...
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4answers
225 views

Is it possible to decontaminate wine?

Is it possible to decontaminate my wine after some (not too clean) objects fell into it? I was straining my blackberry/elderberry wine through a straining bag. The brew is about a week old at this ...
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2answers
61 views

Will car/motorbike fumes affect beer fermentation?

I plan on brewing my beer and letting it ferment for 2 or so weeks in my garage. Unfortunately there are a lot of fumes (eg. From the car and motorbike) and I'm worried that the fumes may affect the ...
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1answer
236 views

Flies in wine before airlocking

I picked some wild blackberries, mashed them up with sugar and water, plus yeast and two campden tablets, and put these into a bucket and covered (loosely, with a t-shirt - that was probably my ...
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2answers
84 views

Potential fat in wort, what's going to happen?

I had some bad luck the other day and half way through my boil a small but significant amount of water fell in my brew from my extractor fan. I haven't given the extractor a good clean in a while and ...
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1answer
52 views

If you make wine in higher quantities, is there a higher chance of contamination?

I am currently only making wine in one gallon quantities but I am looking at increasing that. As a beginner is there more room for making a bad wine if there is more of it?
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1answer
170 views

White film at top of bottle

After 7 days in bottle I find out a white film at the top of the beer. This film isn't in every bottle, just in 1/3 of batch. I openned one and it's tasted good. I need to know if it's an infection ...
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1answer
151 views

Floating fibres in Bochet mead

I made a Bochet style mead (burnt honey mead) and it's spent about a week bubbling away, but there's some strange fibrous floaties that I've never seen before, circulating around the must. They ...
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3answers
475 views

Safe to return sampled wort to the primary after sampling?

I made my second batch of beer (ever) last Friday night, and in a few days' time I'd like to sample a bit of it so that I can check its gravity. Provided that I sanitize all of my equipment (siphon, ...
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2answers
2k views

Does opening the tap of a fermenter bucket increase the chance of contamination?

Sometimes when I want to take a sample of my beer I open the tap of the fermenter (in my case a plastic bucket) and let drip a little bit of beer (primary fermentation). Does this increase the chances ...
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303 views

Does the amount of air left in the fermenter increases the chance of contamination?

Usually when the mashing process is over and the liquid is transferred to the fermenter there's a head-space of air. Lately I've made smaller batches of approximately 5 liters (a huge inefficiency, i ...
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1answer
101 views

Does this look contaminated?

This is the first all grain I made, it's a coconut porter and seems like some grains made it through. This is right before I transferred to my secondary fermenter, I know you can't tell much by only a ...
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2answers
327 views

Is H2S poisonous in wine?

So I have a batch of wine that seems to have been contaminated and has the sulfur smell that is characteristic of H2S. Clearly I can't sell or give away this wine, but is it still safe to drink?
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1answer
1k views

Dangers of non-sterile cider

Come the time of the year when apples are ready, and the excellent harvest this year in Finland, I have decided to give cider making a try. I have a fair amount of experience making beer at home and ...
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1answer
300 views

What kind of infection shows a white film with dots in secondary?

Hi! Okay, so around month ago I made a saison with some mixed frozen strawberries (1 week in the freezer) added to the primary fermentation (fermented with S.Cerevisiae strain). After three weeks I'...
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2answers
109 views

How long can mead store when not temperature controlled?

I was given 10 gallons of homebrewed mead in a carboy. It was made by my brother-in-law and his friend almost 10 years ago. His friend moved away and he's kept the mead in the carboy, in a box (so ...
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2answers
1k views

How to troubleshoot for either bad wort or bad yeast?

Brand new to brewing, 2.5 days ago I brewed my first extract kit (Brewer's Best Amber Ale) and racked it into my fermenter. By tomorrow morning I'll be at the 3 day (72 hours) milestone, which is what ...
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1answer
906 views

Can a homebrew with a FG of less than 1.000 become infected?

My 100% pilsner mashes that are fermented with Wyeast 3711 French Saison routinely hit a FG of 0.996. If bacteria contamination was introduced after fermentation was complete, is it possible for the ...
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3answers
1k views

Will Brett C contaminate my equipment?

Thinking about doing a 100% Brett C beer. If I was to do this, would the Brett flavor seep in to my equipment, forever dedicating it to Brett and sour beers? I ferment in glass carboys then use a ...
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275 views

What do I risk for leaving my beer exposed to open air through the airlock hole?

I brew away from home, and last weekend I has to rush away before I was completely racking from primary to secondary. I can only go back in about 10 days. As a result, my beer is now sitting in a ...
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1answer
124 views

What are the most crucial moments for beer contamination?

I know that sanitization is one of the most fundamental parts of making a beer and I myself wasted two batches already for not being diligent as I should. So, what are the steps / moments when you are ...
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209 views

Is beer more vulnerable to contamination than hard cider

I have made about 10 batches of hard cider. I have yet to have a contamination issue ruining a batch. I clean the carboy with washing up liquid and warm water. The bottles are the same. I use a juice ...
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3answers
2k views

I'm worried about adding germs to my brew when dry hopping

I'm looking at these instructions - http://www.geterbrewed.com/craft-a-beer-instructions/ (I promise I'm not selling anything). In section 13, it says something along the lines of "Add the hops after ...
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6answers
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My cooled wort got contaminated by tap water. What are the primary consequences of re-boiling?

One of the hose clamps for the cooling spiral malfunctioned, so my cooled wort got contaminated by roughly 10 liters of tap water (in a 55 L batch). This is a lager beer which will be stored for five ...
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3answers
456 views

Is my batch contaminated("infected")?

Its been fermenting for about 10 days, and I'm just now noticing these white spots. Is this what the start of an infection looks like? If so, is there anything I should do?
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1k views

Yeast not settling or contamination?

Having trouble understanding what I'm looking at here (see pic): http://imgur.com/1OH9TQj Made an Amber ale with LME and used Wyeast 1332 Northwest Ale. Racked to secondary after 2 weeks to get ...
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1k views

I can't differentiate between OCD or the smell of vinegar, and need some guidance

Here's my brief story: Bought a Mr. Beer kit and didn't have a clue what I was doing, and out of impatience would squeeze the fermentor to smell the brew, resulting in an infection. I now have cheap, ...