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Old 10-10-2013, 01:12 PM   #1
uspsdriver
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Default Pitching on top yeast cake

I just racked a 5 gal.pale to secondary I just finished a 10 gal.batch of the same beer I was wandering if I put the yeast cake from the 5. Gal in my ten gal fermenter would it do the job or do I need to add some more thanks

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Old 10-10-2013, 01:18 PM   #2
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I bottle/keg and brew on the same day and do this all the time. You should use a pitching calculator to get the correct amount of yeast. That being said I pitch 10G batches on full yeast cakes all the time and have had no issues that I am aware of.

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Old 10-10-2013, 01:21 PM   #3
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Quote:
Originally Posted by uspsdriver View Post
I just racked a 5 gal.pale to secondary I just finished a 10 gal.batch of the same beer I was wandering if I put the yeast cake from the 5. Gal in my ten gal fermenter would it do the job or do I need to add some more thanks
you would be over-pitching. about a quarter of the cake is all you need.
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Old 10-10-2013, 01:21 PM   #4
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The yeast cake from a 5 gallon batch is more than enough for a 10 gallon batch. Its probably twice as much yeast as you need. That could theoretically alter the taste (over pitching) in a negative way.

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Old 10-10-2013, 01:22 PM   #5
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Quote:
Originally Posted by progmac View Post
you would be over-pitching. about a quarter of the cake is all you need.
A quarter would not be enough for a 10 gallon batch.
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Old 10-10-2013, 02:09 PM   #6
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I actually do this all the time with no ill effects as far as I've noticed. I brew and keg the same day then usually just dump the wort into the fermenter I just kegged. I tend to do this a lot with wheat beers. I like using wlp320, I've actually used the same yeast cake up to 3 times. Last time I did this I did it with a low gravity centennial blonde and then used the yeast cake for a two hearted clone.

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Old 10-10-2013, 02:36 PM   #7
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Quote:
Originally Posted by ArcLight View Post
A quarter would not be enough for a 10 gallon batch.
it certainly could be. an average 5Gal batch only needs like 0.5cup slurry
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Old 10-11-2013, 01:02 PM   #8
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Originally Posted by dcp27 View Post
it certainly could be. an average 5Gal batch only needs like 0.5cup slurry
Half a cup of well washed slurry. But the stiff at the bottom isn't washed and has a much higher percentage of trub. (the non yeast percentage on Mr. Malty would be scaled up)

It's not like it won't work, yeast reproduces, but you are under pitching.
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Old 10-11-2013, 01:12 PM   #9
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Quote:
Originally Posted by ArcLight View Post
Half a cup of well washed slurry. But the stiff at the bottom isn't washed and has a much higher percentage of trub. (the non yeast percentage on Mr. Malty would be scaled up)

It's not like it won't work, yeast reproduces, but you are under pitching.
check the #s, even at the thinnest settings, it only takes 1 cup.
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Old 10-11-2013, 02:46 PM   #10
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Originally Posted by dcp27 View Post
check the #s, even at the thinnest settings, it only takes 1 cup.
I suggest you check the numbers. The yeast slurry Mr Malty expects is not the same as the stuff at the bottom of the fermentor. The stuff at the bottom of the fermentor has far more than 25% no yeast material.
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