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Home Brew Forums > Home Brewing Beer > Fermentation & Yeast > Did I kill my yeast with StarSan?
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Old 11-22-2012, 03:15 AM   #1
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Default Did I kill my yeast with StarSan?

I was making an 1 L starter and had about 100ml of StarSan in the container, and I forgot to dump it before I added the wort with the yeast in it. I'm thinking that I killed the yeast. It was a pack of dry safelager yeast mixed in with 1L of water with 100 g of DML. I measured the pH after I mixed it in (when I realized that I had forgotten to dump the StarSan) and it is at 5.0.

Is my yeast toast?

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Old 11-22-2012, 04:20 AM   #2
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Should be fine. Yeast, supposedly, actually like a bit of starsan to help them get into the mood for metabolizing sugars.

Probably did more damage measuring PH of the starter wort than adding on top of the starsan

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Old 11-22-2012, 04:24 AM   #3
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I gotta tell ya, I would not be putting starsan in my beer, whether it will hurt you or not. Dry yeast is cheap enough to buy another pack!

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Old 11-22-2012, 04:25 AM   #4
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You probably did not kill the yeast with the Starsan,

But the question is why are you making a starter with dry yeast. It is not necessary, and potentially not as good as just re-hydrating.

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Old 11-22-2012, 04:40 AM   #5
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Reason for the starter is that it was a lager. I am under the impression that lagers require a lot of yeast to get started.


To measure the pH, I simply poured off a little bit out to a separate container so I don't think that I could have infected it.

Thanks. I guess I'll just see if it gets going. If not, I'll be back at the LHBS to get some more yeast.

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Old 11-22-2012, 05:03 AM   #6
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For future reference, and I only gleaned this bit of useful info very recently from another thread on here, supposedly dry yeast is packaged at its fully developed potential so using it in a starter actually depletes the yeast's reserves. Re-hydrating in clean, luke-warm water a couple of hours before pitching definitely has benefits and my most recent batch got off to a roaring start within 18 hours of pitching. Pitched at 68, showed signs of fermentation and beginnings of krauzen whilst at 62 and then went full on Vesuvius for 5 days.

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Old 11-22-2012, 02:30 PM   #7
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That's a good thing to know. I guess I'll remember that for next time. Maybe what I should have done is used two packs of dry yeast, rehydrated them and be done. At this point, the starter is doing very well, so the yeast is obviously not dead, so I'll just crash it, decant it and use it as is.

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Old 11-22-2012, 02:38 PM   #8
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Yeast likes starsan it breaks down into food for them. Like a yeast energizer. Nothing to worry about.

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Old 11-22-2012, 02:41 PM   #9
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You can buy dry lager yeast? I thought all dry yeast was ale yeast?

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Old 11-22-2012, 02:43 PM   #10
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Quote:
Originally Posted by kombat View Post
You can buy dry lager yeast? I thought all dry yeast was ale yeast?
Saflager is a dry Larger yeast by fermentis.
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