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Old 09-24-2013, 01:35 PM   #1
Ster
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Thanks to some smart people here, I just learned that a single pack of SF05 is about 1/3 of the recommended yeast cells for a 1.05 OG ale.

Wow.

Do you pitch 3 packets? Why or why not?

 
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Old 09-24-2013, 01:36 PM   #2
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I've never heard that before, and I don't think that figure is correct.

There are something like 230 billion yeast cells in an 11 gram package, which is more than a sufficient number for an OG of 1.060 ish at least.
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Old 09-24-2013, 01:55 PM   #3
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Yooper, that's what I thought.

However their web page says 6e9 cells per gram. Multiply by 11.5g = 6.9e10

69 Billion per packet.

 
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Old 09-24-2013, 01:56 PM   #4
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I'm positive that number is way off. I pitched that yeast (rehydrated in 400mL water) twice last week,one packet each time. The first one was OG1.061,the second OG1.074. The 1st one pegged the airlock centerpiece against the cap in 15 minutes flat & bubbled once. The 2nd started visible fermentation in 12 hours,nearly to the minute! So even rehydration can speed things up conciderably with one packet for the average gravity ale by being rehydrated.
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Old 09-24-2013, 02:01 PM   #5
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this seems to be a common issue/debate. how many packets, hydrate or not, etc etc. i would say there are a 1000 people who pitch 1 packet of dry with great success and there are another 1000 who pitch hydrated yeast with the same success.

i use US-05 in almost all my beers and never rehydrate.

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Old 09-24-2013, 02:09 PM   #6
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http://www.brewersfriend.com/yeast-p...er-calculator/

They do break down the numbers really well after the calculator itself. They also make claims like this. I don't use their calculator but I don't really trust Mr malty's as well. Usually overpitch by 20% unless I'm looking for esters.

 
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Old 09-24-2013, 02:09 PM   #7
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I rehydrate just to cut lag time. That's about all it's intended to do,since dry yeast packets contain more cells than liquid to start with.
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Old 09-24-2013, 02:51 PM   #8
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Quote:
Originally Posted by Ster View Post
Yooper, that's what I thought.

However their web page says 6e9 cells per gram. Multiply by 11.5g = 6.9e10

69 Billion per packet.
It says >6. Now, it'd have to be MUCH greater to equal what I've understood to be in there, but I"m confident from my own experiences that it's far more than 69 billion cells per package.
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Old 09-24-2013, 04:44 PM   #9
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I am like you JDGator.

I have had nothing but success with SF04 & 05, and have never rehydrated. I have used liquid yeast twice. One was Wyeasy Kolsch and the beer is cloudy as mud even after bottled over a month. The other was White Labs Irish Ale which exploded all over my sink and just started bubbling after 72 hours. I hope it can get near expected FG.

I also seem to get very clear ales with SF05.

 
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Old 09-24-2013, 04:53 PM   #10
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i use s05 A LOT and s04 sometimes too.
anything under 1060 i just toss in one pack dry. anything over 1060 i toss in two.
it always starts bubbling FAST. ive read a lot about uner and over pitching yeast, but for the purposes of most homebrewers it just seems like a pain in the butt for very little gain. i have never done a starter ever and have never ended up with off flavors from "stressed out yeast" or anything.
did a 1085 stout with 2 packs of s05 dry. no problems.

i find it annoying that people call them "smack packs"

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