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Old 09-30-2012, 12:51 AM   #1
BoostedF150
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Default reusing yeast, do I need to wash?

Or can I dump my fresh wort over the entire old yeast cake with trubb and all in the same carbon as the beer before? Btw it is safale 05

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Old 09-30-2012, 12:55 AM   #2
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That will be overpitching if you are not brewing a very big beer and twice the size of your previous brew I wouldn´t do it. About a thir of the yeast cake is what I have used depending of course of what you are brewing

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Old 09-30-2012, 12:58 AM   #3
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I second about a third of the cake...I stash it in a zip lock bag as I consider them sanitary from the package....very easy.

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Old 09-30-2012, 04:15 AM   #4
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Do I need to wash it though or is it ok to use with all the trubb in it?

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Old 09-30-2012, 04:26 AM   #5
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Quote:
Originally Posted by BoostedF150
Do I need to wash it though or is it ok to use with all the trubb in it?
You don't necessarily "need" to, but it might lead to a cleaner beer. I've pitched on a full cake before with no issues. Overpitching on a homebrew scale is actually quite difficult to do.
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Old 09-30-2012, 04:28 AM   #6
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What would be the result of pitching on the entire yeast cake other that just waste

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Old 09-30-2012, 04:31 AM   #7
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Quote:
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What would be the result of pitching on the entire yeast cake other that just waste
Potentially... subtle carry-over flavors from your last batch, particularly if you used a lot of roasted malt or hops.
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Old 09-30-2012, 11:45 PM   #8
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Quote:
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What would be the result of pitching on the entire yeast cake other that just waste
- Quick start, lots of kraeusen, and possible blow-off.

- Due to the increased activity, the temperature will rise quickly, and can result in higher alcohols if not controlled.

- Reduced yeast esters due to reduction in reproduction.

- Since there will be little reproduction, the old yeast will have to complete the fermentation. Could possibly end up with a higher FG than if you pitched less.
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