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Old 12-09-2010, 06:25 PM   #1
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Default A couple yeast starter questions I can't find answers to...

I've made only three batches of beer so far, the last two I made up a starter for. I used a 1L flask and mixed the water:extract per the instructions. Ive used wyeast for both, one was an activator, the other was a propagator. Both had very vigorous fermentation, and blew out the airlock. Is a whole pack of yeast too much for 1L?


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Old 12-09-2010, 06:26 PM   #2
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No. The primary purpose of a starter is to increase the number of yeast.


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Old 12-09-2010, 06:33 PM   #3
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Instead of an airlock, you can cover the flask opening loosely with a sanitized piece of foil (that's what I do, except that I don't use a flask, I use a large Ball jar).
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Old 12-09-2010, 06:47 PM   #4
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You usually dont want to use an airlock on your starters. The goal is to get oxygen in there to facilitate yeast growth. Airlocks only let air out, so you arent achieving optimal yeast growth without the oxygen.

Why 1L starters? mrmalty.com has a pitching calculator that is very helpful, and I find that I usually need more than 1L starters (depending on the OG).
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Old 12-09-2010, 06:48 PM   #5
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I'm gonna use tinfoil next time, since that seems to be what everyone uses. Is there a reason why? Also, why have my fermentations gotten so vigorous, when others say they don't see much happening?

I'm also building a stir plate before the next one, so I'll see how that helps. . .
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Old 12-09-2010, 06:51 PM   #6
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Quote:
Originally Posted by coypoo View Post
You usually dont want to use an airlock on your starters. The goal is to get oxygen in there to facilitate yeast growth. Airlocks only let air out, so you arent achieving optimal yeast growth without the oxygen.

Why 1L starters? mrmalty.com has a pitching calculator that is very helpful, and I find that I usually need more than 1L starters (depending on the OG).
1L was what I bought at the LHBS, guess I should go get a 2L?
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Old 12-09-2010, 06:56 PM   #7
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My starters get up as high as 2 gallons sometimes, but I don't have a stir plate and I rarely brew beer under 1.050.
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Old 12-10-2010, 03:18 AM   #8
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Starter size just depends on the OG and how much yeast I have to make the starter. I have a 1 gallon glass jug and usually that is big enough for most ales- lagers are a completely different animal. If you LHBS has 1 gallon glass jugs get that, otherwise, the cheap gallon-o-wine jugs will work fine.
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Old 12-10-2010, 03:22 AM   #9
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i use a bomber (22 oz beer bottle) covered with saran wrap loose (no rubber band) when i use liquid yeast
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Old 12-10-2010, 04:18 AM   #10
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Quote:
Originally Posted by coypoo View Post
Starter size just depends on the OG and how much yeast I have to make the starter. I have a 1 gallon glass jug and usually that is big enough for most ales- lagers are a completely different animal. If you LHBS has 1 gallon glass jugs get that, otherwise, the cheap gallon-o-wine jugs will work fine.
I wouldnt use a 1 gal starter for a 5 gallon wort would I?


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