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Old 06-14-2011, 06:31 PM   #1
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Default yeast starter stepping question.

I'm making a starter of wyeast 1056 using a 2 litre erlingmeyer flask and a single pack. Based on the pitching rate calculator i'd need a 4 liter starter. If I decant my starter after a day or so and feed them another 2 liters of wort will I get the same effect as using a 4 liter starter?


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Old 06-14-2011, 07:36 PM   #2
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That's the way I do it.


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Old 06-14-2011, 10:34 PM   #3
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Me too.
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Old 06-15-2011, 12:19 AM   #4
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No, its not the same because the concentration of yeast is different which effects the growth. A 4 L starter will net you about 250 billion cells (no stir plate and assuming you start with ~100 billion) whereas 2L to 2 L will net you about 300 billion (same assumptions as before).
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Old 06-15-2011, 12:23 AM   #5
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What about if I'm using a stir plate for both? Start with a 2L starter/stir plate...ferment, crash, decant...pitch another 2L starter w/stir plate? Is that over kill?
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Old 06-15-2011, 12:44 AM   #6
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Yes, that's overkill because a 2 L starter with stir plate will get you about 300 billion cells. This is why I got a stir plate because it reduces the need to step up a starter.
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Old 06-15-2011, 01:15 AM   #7
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So would it get me in the range I want to be in if I decant the 2 litre starter and add back about 1 litre of wort to buff them up a little more or should I just pitch the 2 litre starter I've already got and call it good? Is it worth anything in results to try to get that extra 50 or so billion cells?
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Old 06-15-2011, 01:21 PM   #8
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That should get you about 250 billion, but of course this all depends on the viability of your yeast. I don't know what your expected OG is and how fresh your yeast is. I always try to pitch within 10% of the calculated cell count.
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Old 06-15-2011, 03:52 PM   #9
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Quote:
Originally Posted by sjbeerman View Post
Yes, that's overkill because a 2 L starter with stir plate will get you about 300 billion cells. This is why I got a stir plate because it reduces the need to step up a starter.
Ok...so that's over kill for an ale...but i've VERY frequently heard to pitch twice as much for a lager. This technique would work great for my oktoberfest, wouldn't it?
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Old 06-15-2011, 04:05 PM   #10
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Ok, I was assuming you were referring to an ale. For a lager, that should work just fine.


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