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Old 07-09-2011, 01:40 AM   #1
thomasben
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Default Yeast slurry

When saving yeast from a previous batch how much will I want to pitch? Like if I collect a cup or two in a mason jar and put it in the fridge will I want to pitch all of it or will that be over pitching ...its tough to know how many billion cells are on must yeast cake if that makes sense..

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Old 07-09-2011, 01:48 AM   #2
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http://www.homebrewtalk.com/f163/yea...strated-41768/

Per that procedure, I'd pull one pintish sized jar, pitch it into a starter (size dependent on the gravity of your beer), and go.
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Old 07-09-2011, 03:22 PM   #3
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As a rule of thumb, if using slurry within a month of collecting it, I use about a quarter of the old cake. I don't make a starter; just pitch it. After a month, I use the same amount, but make a starter to ensure the yeast is viable.

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Old 07-09-2011, 03:42 PM   #4
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Quote:
Originally Posted by jaycount View Post
http://www.homebrewtalk.com/f163/yea...strated-41768/

Per that procedure, I'd pull one pintish sized jar, pitch it into a starter (size dependent on the gravity of your beer), and go.
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Old 07-09-2011, 03:56 PM   #5
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Some pint jars have milliliter measurements on the side. Mr. Malty will tell you, for example, you need 50 ml of thick slurry. Once the yeast in your jar packs down to a thick slurry on the bottom, you can compare the volume of that slurry to those measurements. It's not laboratory-precise but I've never had a problem doing it that way.

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Old 07-10-2011, 06:49 PM   #6
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Gotta be more advice out there...

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Old 07-10-2011, 07:05 PM   #7
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I have always just poured the whole jar into the fermenter. I have also poured fresh wort into a newly emptied fermenter right on the old cake. I am sure someone will tell me why it's not true but I just don't believe in overpitching for 5 or 10 gallon batches of beer using slurry from 5 or 10 gallons of beer.

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Old 07-10-2011, 07:18 PM   #8
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Quote:
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Gotta be more advice out there...
What else are you looking for? I think Jon's method of using the Mr. Malty calc in conjunction with a volume measurement is probably the most consistent. You can end up with more slurry in one jar than another so it's good to have some sort of measurement.
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