Yeasts are micro-organisms used in brewing to produce alcohol during the process of fermentation.

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What is this part of the fermentation called?

I'm seeing this thing happen soon after I add my yeast and was wondering what it was called and the science behind it.
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For 2L of final cider do I need to put the whole yeast sachet?

I have only 4kg of apples, which will give me 2L of cider. I'm using an 11g dry yeast sachet. Do I need to pour the whole 11g or just 5g? If I use it all, will the final taste be influenced by the ...
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[CIDER]: Should 10mm of foam in the presed juice affter a day be an issue?

Should 10mm of foam in the presed juice affter a day be an issue? This is before the yeast starter.
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Can I wash yeast with tap water or starsan?

I'm wondering what the easiest way to wash yeast after a brew might be, with the aim to store it in the fridge. The usual recommended method I've seen is to boil the water used for washing with the ...
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How long can something be left on the lees before needing to add more yeast if intending to bottle condition?

I have a mead that I plan on bottle conditioning. With beer, due to the short turn-around time, you can usually just rack onto some priming sugar and bottle, and the remaining yeast will eat the sugar....
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Yeast for making (non alchoholic) ginger beer

I'm planning to make some ginger beer. I want it to be non-alcoholic, and I am ordering some wine yeast to ferment it. I have two questions about yeast, though, since I am new to fermenting anything. ...
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Can I add more yeast during primary fermentation?

I've got a brew that's been on primary fermentation for 10 days and still haven't seen any activity in the airlock (again). Gravity has dropped from 1.040 to 1.014, but I'd still like to raise the ...
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Yeast Attenuation: Mangrove Jack's M79 Burton Union

What attenuation percentages have people actually seen with this yeast? The back of the package specifies the attenuation as "HIGH", but my own experience suggest that it is medium or low.
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Rack onto yeast cake then fast rack to secondary?

I'm reusing my yeast for a while, and my procedure now is to have a wort ready when I want to bottle or keg a previous batch. So I drain the finished beer out of fermentor, and then collect some yeast ...
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Questions on keeping a yeast strain going over and over

I have a couple of yeast questions that I have not found the answer to yet. I recently washed my yeast from a batch of beer using something like this. I got 5 jars of yeast out of this, and I assume ...
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Harvested yeast gone bad, or am I doing something wrong

After my last brew(beginning of may)I harvested the yeast cake(slurry) to 3 glass jars, put them in the fridge to store them for my next brew(11. June 2016). I'm about to make a starter to get the ...
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357 views

Fermentis S04 vs.US05

I am trying dried yeast for the first time. I did up 100 litres of English IPA yesterday and I pitched 2xS04 into 50 litres and 2xUSO5 into 50 litres. Anybody want to hazard a guess at the ...
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What Type and Power of Microscope For Observing Yeast Cells

I'm interested in buying a microscope that I can use to observe yeast cells. Ideally, I'd like to use this to count cells in region and do calculations to get estimated populations (though I don't ...
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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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Brewing with rainwater / tank water

I'm lucky enough to have beautiful New Zealand rainwater to brew with. But what are the considerations in terms of mineral content? Is rainwater close to distilled water? Having gone through the same ...
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191 views

Use expired yeast or wait for new yeast to arrive?

I just brewed with what I now realise is a rather old Williams Brewing Kolsch kit. The yeast is Wyeast 2565 Kolsch and the packet has already expanded. I have no idea when it expanded, so I assume ...
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Degassing and it's effects on yeast

I'm wondering if degassing and removing the suspended CO2 (a part of, and a percentage of the wine) changes the totals for ABV% as it applies to yeast tolerance. It seems that by degassing you would ...
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Altitude and Yeast

I live at 9200 feet I am on my second batch of beer. Both batches did not really chug as I call it.First batch tastes great but no carbonation Second batch yeast rose up but went flat in 1 day just ...
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163 views

How much fermentis/safale US-05 yeast to use?

I wondered if anyone who has used the above yeast can give me an idea on the quantity required. I am brewing a fairly high SG IPA (somewhere in the region of 1.065-1.080) batch size 15-20L. Brewers ...
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Brewing - forgot to stir in yeast

I added the yeast to my fermentation bucket and closed it up without stirring. Remembered about 8 hrs later; opened bucket, lots of yeast floating on top, stirred it up good and closed it. Have I ...
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Minimal airlock activity

So I've just finished my 3rd all grain brew yesterday, first time trying a stout. After 24 hours, I'm only getting ~4 bubbles per minute on the airlock. Last night about 8 hours after pitching the ...
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How long can I keep a slant/plate in a domestic fridge/freezer?

I am considering plating up some yeast/isolating cultures and starting my own small yeast bank, I know that If I were to keep these at -80C in a lab freezer they would keep for years, but how long ...
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What would be a good dry yeast equivalent to Wyeast 3787?

I'm looking to produce high gravity strong Trappist like beer. Wyeast 3787 seems to be a good choice, but I'm looking for a dry yeast alternative. Suggestions? I'll make a starter before pitching if ...
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What is the longevity of dried belle saison yeast at room temperature?

I am starting to brew beer and when I bought my kit the yeast was stored in a fridge and I forgot to put in my fridge when I got home. It is dried "belle saison" yeast and was at room temperature for ...
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Not quite at FG with an extract batch after two and a half weeks… Safe to bottle?

It's a simple US-05 extract batch. OG was 1.063 and I'm currently on 1.016 where projected FG was 1.012. Gravity has been stable for three days. It's also absolutely delicious so I'd gladly bottle it ...
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My yeast won't ferment

I washed my fermenter out in meta bisulphate I then added a quarter teaspoon of bentonite followed by 12 litres of apple juice. My SG was 1060. I added 2lb of sugar for a stronger brew, SG then 1085. ...
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Does yeast choice matter as much in ginger beer?

I'm about to brew a ginger beer and was wondering if the choice of yeast is as important in a ginger beer, where the ginger dominates the flavour. I've got the yeast-under-the-cap packet and a US-05 ...
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Brewing with Saccharomyces boulardii

I have a friend who studies some molecular aspects of probiotic yeasts, some wild ones and also the widespread in medications Saccharomyces boulardii (found in Florastor®, Floratil®, and other ...
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Waited 6 Days after boil to pitch yeast, Wort had what looked like mold, what can be done?

Like the title says, after I chilled my wort I realized the kit I ordered did not come with yeast, an error on the packers fault. Because of my work schedule I wasn't able to pitch the yeast for about ...
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Possible wild yeast contamination?

In May I brewed the following beer: 81% Pale 2 row malt 16% Brown malt 3% Black malt Single step mash at 73C. With 290g of hops for a total of 103 IBUs. The OG was 1.077 and it went into primary ...
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How much does oxygen exposure to wort affect yeast being aerobic or anaerobic?

To the best of my understanding of making beer, wort must first be properly aerated to provide oxygen for the yeast to multiply when first added to the wort. After all the oxygen is consumed, the ...
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Is this pediococcus contamination('infection')?

A berliner weisse we forgot to bottle for around a month and a half. Did not introduce pediococcus or lactic acid in the fermentation. Did a sour mash before the boil so lactobacillus shouldn't have ...
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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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How quickly will bread yeast take to create an ethanol concentration of…?

How quickly will bread yeast take to create and ethanol concentration of ~15%~,~10% and ~5%~ in at 30°C.I believe bread yeast is designed to rapidly fement(at first at least) but is not that ethanol ...
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Yeast done with Fermentation? [duplicate]

How do i know when my yeast is done with it's primary fermentation cycle. Are there physical markers and/or sighs. I am using bakers yeast just because I would like to see what it yields. There is ...
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Scaling up from a colony

I am preparing to start my own small yeast bank and I was wondering what is the optimal method for scaling up to a starter from a single colony. What step sizes should I use? What strength of wort ...
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Wyeast 3724 hot fermentation

As I'm living in Singapore I'm trying out an experimental all extract recipe consisting of pilsner malt, crystal malt and amber malt together with Wyeast 3724. I've hopped it with Centennial and ...
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What is the highest OG which is still fermentable?

How high can you push OG, taking sugar I know you can easily make a solution up to ~1180 (500g in 1 litre), but how high can a super saturated solution be? And, at what limit does it become un-...
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How many times can yeast be reused?

A good yeast sample can be retrieved, stored & reused regularly across brews. Is there a limit to the number of generations a sample can last? I've heard that after so many generations a strain ...
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Can I overyeast by adding one pack of Wyeast for brewing 2.5 gallons

I was wondering if I add a complete pack of Wyeast to a 2.5 gallon batch rather than a 5 gallon batch what would happen. Would I "overyeast" the beer?
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No fermentation after 3 weeks

About 3 weeks ago I brewed my very first beer, a simple lager. I checked on the beer after 1 week of fermentation and now again after a bit over 3 weeks. At both times the density of the beer didn't ...
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Wine Quality Sensor

I am an engineer who's built a wine quality detector. My sensor can pick up a wide variety of chemicals at levels as low as parts per million (ppm). With no background in wine production myself, I ...
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What's the best method of storing yeast for 4 to 6 months in the refrigerator?

I've done a bit of research into different options of yeast storage and so far the least time consuming and most accessible methods seem to be: Making a slant from a yeast sample taken directly from ...
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Spongy, corally residues in fermentation bucket

Cracking open the fermentation bucket on bottling day revealed some sponge-coral look-a-likes floating around on the top of the brew. I have never seen this an any beer before, and other beers, based ...
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Reactivate Yeast?

First time home brew. I followed instructions and pitched yeast into wort (which looked like mud) airated it a bit, placed in my basement with a cover over it. There was a bit of activity in the ...
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2answers
51 views

Starter wort volume = BEFORE or AFTER 10-15 minute boil

Being fairly new to used starters, I'm somewhat confused as to how much volume of water to boil when adding DME to create a starter. For instance, if the Kalkulator I'm using says to start with 2 L ...
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Does lagering reduce yeast so much that bottle carbonation is effected?

My first lager (a German Pils) turned out quite good! From the keg, it's great, but the half dozen bottles I filled are completely flat!? I used a little more priming sugar per bottle than my usual ...
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Can I use wine yeast to ferment beer?

Can I use wine yeast to ferment a beer? What sort of problems might I encounter that are unique to wine yeast trying to ferment malt sugars? What sort of flavor differences might I encounter?
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Blackberry wine yeast?

I am making a one gallon batch of blackberry wine. What type of yeast would you recommend? I would like the wine to be on the sweet side. Thanks!
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under pitched (1st) yeast-aerate into fermenter on 2nd (new) pitch or no?

I brewed an all grain stout 2 weeks ago, OG was 1.087 which was almost spot on for where I'd hoped. However, I mis-calculated the pitch rate for my starter. Racked to secondary to dry hop with mint (...