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Old 05-04-2013, 10:21 PM   #1
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Default Rehydrate Safale US05 YEs or NO?

I making an American IPA and OG is going to be 1.065-1.070 and I am going to use Safale US 05.. Should I just rehydrate 1 packet or just pitch 2 packets or should I rehydrate 2 packets?

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Old 05-04-2013, 10:22 PM   #2
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If its an 11grqm pack rehydrate it and pitch

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Old 05-04-2013, 10:37 PM   #3
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1 packet is good. I would rehydrate.

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Old 05-04-2013, 11:00 PM   #4
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Rehydrating is easy. Why not? I think you need two packets at that OG.

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Old 05-04-2013, 11:06 PM   #5
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One packet will be fine at that OG, and I agree that rehydrating is easy, especially if you just use a microwave to boil the water in a pyrex measuring cup, cool it in a small water bath, and add the yeast to the water at 95*-105*.

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Old 05-04-2013, 11:26 PM   #6
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According to Brewing Classic Styles 5.5G of 1.070 SG wort needs about 275B yeast cells. According to the same book you will get 10-20B cells per gram of dry yeast.

Fermentis spec sheet for US-05 (don't know which yeast you are actually using) says there are 6B viable yeast cells per gram.

So to decide how much yeast to use decide how many viable yeast cells per gram you think you will get and divide 275 by that number. There are 11 grams per pack.

I would assume somewhere in the middle and go with 2 packs.

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Old 05-05-2013, 12:09 AM   #7
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I know this is against the grain here, but I pitch dry yeast directly into the wort and I've never had a single problem. US-05 usually takes off for me within 24 hours from dry. I know its easy to do and I know there is some benefit to it, but from my experience, I end up with great fermentations and I don't feel the need to change it up.

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Old 05-05-2013, 12:14 AM   #8
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Quote:
Originally Posted by Chromebrew View Post
I know this is against the grain here, but I pitch dry yeast directly into the wort and I've never had a single problem. US-05 usually takes off for me within 24 hours from dry. I know its easy to do and I know there is some benefit to it, but from my experience, I end up with great fermentations and I don't feel the need to change it up.
To beat a dead horse...zactly. One packet will do, but I'd probably put in two for sh&^ and giggles.
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Old 05-05-2013, 12:18 AM   #9
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I'd go 2 packets, rehydrated. Why skimp on yeast, you don't cut corners anywhere else, do you?

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Old 05-05-2013, 12:41 AM   #10
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Thanks a lot for all great info!!!

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