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Home Brew Forums > Home Brewing Beer > Fermentation & Yeast > Do I need to rehydrate Safale s-04?
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Old 03-07-2012, 12:51 AM   #1
TomToro
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Default Do I need to rehydrate Safale s-04?

Do I need to re-hydrate this yeast before I use it? I've just sprinkled it in before and it worked well, but after reading the instructions on the site, looks like I'm supposed to.

Is it really necessary?

How do you re-hydrate this yeast? Is there a site somewhere I can find out?

Thanks,
Tom


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Old 03-07-2012, 12:58 AM   #2
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Quote:
Originally Posted by TomToro View Post
Do I need to re-hydrate this yeast before I use it? I've just sprinkled it in before and it worked well, but after reading the instructions on the site, looks like I'm supposed to.

Is it really necessary?

How do you re-hydrate this yeast? Is there a site somewhere I can find out?

Thanks,
Tom
Ask and you shall receive.
http://http://www.fermentis.com/FO/p...le_S-04_HB.pdf


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Old 03-07-2012, 12:58 AM   #3
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Rehydrate by putting in watm water 90* i think. I simply get a cup and run water till it starts to get warm, fill cup and add yeast. let sit 15 minutes , stir and pitch.
does'nt get much easier than that.
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Old 03-07-2012, 02:40 AM   #4
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I would suggest using preboiled water that has cooled, your tap water has some nasty stuff in it. I know I've had better results that way. I also sprinkle mine in preboiled water closer to pitching temps, say 80ish a half hour before pitching. I figure (caveman logic) that the water is free of oxygen and nasties, and will cool to pitching temps by the time I pitch. Just an opinion, not a scientist.
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Old 03-07-2012, 02:44 AM   #5
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It is not "necessary" but it is recommended because sprinkling directly into wort has been said to kill half of them.
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Old 03-07-2012, 02:49 AM   #6
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I pitched dry yeast and had OK results. Seemed like I under pitched a lot with dry yeast. I got better results by rehydrating. I always use water that I boiled and let cool to the propper temp.

I just finished my stirplate so I'm going to go with making starters next
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Old 03-07-2012, 03:02 AM   #7
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I have both sprinkled and rehydrated, and in my experience the biggest difference has been a shorter lag time when using rehydrated. As I am chilling the wort, I pull 3-4 ounces of 80-90 degree wort and rehydrate the yeast in it for about 30 minutes while I finish chilling and filling the fermenters.
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Old 03-07-2012, 03:16 AM   #8
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I do re-hydtrate dry yeast. However, I don't bother to boil my water for re-hydrating but I do use water that's been though a charcoal filter. I bring it up to temp (85-ish) in a hot tap water bath. I haven't had a problem yet.
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Old 03-07-2012, 03:27 AM   #9
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for simplcity ive done both, and neither were better than the other, besides after you stir the yeast in the wort, its rehydrated within minutes!
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Old 03-07-2012, 03:55 AM   #10
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I have used S04 since around '98, both in commercial breweries and at home, and have never rehydrated it. It works fine as it is. I don't see the need to throw in an extra step and increase the risk of contamination. I pitch dry and always have signs of active ferment in about 8 hours.

It is said that not rehydrating will reduce the viable count, that is probably true, but the yeast will grow quickly and use their dead buddies as food... in the end the result is the same, so why bother? All that matters is what hits the glass


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