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Old 09-23-2010, 05:33 PM   #1
Fletch78
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Default Why Wash Yeast?

I am just about to bottle some beer and follow the sticky on washing the yeast cake, but then it occured to me, if I'm going to reuse it within 2 weeks anyway, can't I just keep a sterilized jar of the yeast cake in the refrigerator? I understand that washing will create several 'batches' to reuse later, without additional regenerations/mutations, but other than that, any other purpose?

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Old 09-23-2010, 05:38 PM   #2
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To get that fresh linen aroma?

Other than that, you pretty much summed it up except that you also remove break and hop material from the yeast cake in the washing/settling process.

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Old 09-23-2010, 05:42 PM   #3
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The sediment at the bottom of your fermenter is a mix of yeast and trub. With yeast washing there you are removing the trub from the yeast so that you aren't carrying over excess trub into your next batch.

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Old 09-24-2010, 08:03 PM   #4
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Did the trub ruin your last beer? If so I'd say remove it. If not then why bother. Do what makes you feel comfortable but I know many brewers who brew award winning beer in reused yeast that wasn't rinsed. I would probably rinse if I had more time but I find it hard to make time for brewing as it is so it isn't worth it to me.

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Old 09-24-2010, 08:32 PM   #5
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Do you not strain your wort into the fermenter? If you dry hopped, did you use a hop bag? If your answer to both of those was yes, you probably don't have too much non-yeast trub anyways, so I would fully support your plan. If your answer to either one is no, I would consider washing if I were you. If your answer was no to both, then I would strongly suggest washing your yeast.

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Old 09-24-2010, 09:12 PM   #6
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I chill and whirlpool my wort and siphon mostly clear wort into the fermenter. If it's particularly cloudy looking I'll put a nylon bag over the autosiphon to filter further. I do use a hop bag because I don't want that hop material staying around long enough to leech grassy flavors into the beer. It works. I really only reuse if I want to brew a high gravity beer because its the best way to get enough yeast for one. Otherwise I'd rather buy a fresh vial of yeast than waste the time. Never gone over a 3rd generation.

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Old 09-24-2010, 10:30 PM   #7
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I washed yeast today. There's so much stuff in the fermenter besides yeast that I think it's a good practice. I follow the yeast washing procedure show in the sticky at the top of the page, and it fits right into my bottling day with very little extra time. I do the sterile water ahead of time, so it's cold and in the fridge for a day or several days before I wash the yeast.

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