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Old 10-01-2010, 11:22 PM   #1
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Default Two packs of Safale US-05 vs. Rehydrating

Hi all,

I've spent hours trudging through the threads on rehydrating dry yeast vs. not rehydrating, and I'm still undecided. So here is my question:

Tomorrow I am brewing a beer which I expect to have an OG of 1.070. I have seen many threads that say just sprinkling the dry yeast (Safale US-05 in this case) on the foam after aerating is fine for "normal gravity" beers. Does 1.070 qualify as "normal gravity?" My hunch is that it's a bit higher than "normal." So, what if I just sprinkle TWO packets of yeast on the foam instead of rehydrating?

It's not that I'm against rehydrating, but I have some concerns about the timing of the whole thing (not really sure when I should start the rehydration) and the process in general, so I'd much rather just rip the packs open and sprinkle it on there if possible.

Thanks!

Doug

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Old 10-01-2010, 11:41 PM   #2
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Hi Doug, this is the best calculator for figuring out how much yeast to use: http://www.mrmalty.com/calc/calc.html

for your OG, Mr. malty sais to use about 1.2 packets (11.5 gram dry yeast packets).

I've never re-hydrated so I've got nothing to add there, other than all of my beer has turned out great and I've always just sprinkled it on top of the aerated wort...

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Old 10-01-2010, 11:41 PM   #3
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Start rehydrating 30min before you plan on pitching. It really is painfully easy.

Just rehydrated and pitch a single packet, you'll be fine

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Old 10-01-2010, 11:43 PM   #4
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Quote:
Originally Posted by phatuna View Post
all of my beer has turned out great and I've always just sprinkled it on top of the aerated wort...
this is HIGHLY subjective
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Old 10-03-2010, 02:00 AM   #5
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Quote:
Originally Posted by dsmithpdx View Post
Hi all,

I've spent hours trudging through the threads on rehydrating dry yeast vs. not rehydrating, and I'm still undecided. So here is my question:

Tomorrow I am brewing a beer which I expect to have an OG of 1.070. I have seen many threads that say just sprinkling the dry yeast (Safale US-05 in this case) on the foam after aerating is fine for "normal gravity" beers. Does 1.070 qualify as "normal gravity?" My hunch is that it's a bit higher than "normal." So, what if I just sprinkle TWO packets of yeast on the foam instead of rehydrating?

It's not that I'm against rehydrating, but I have some concerns about the timing of the whole thing (not really sure when I should start the rehydration) and the process in general, so I'd much rather just rip the packs open and sprinkle it on there if possible.

Thanks!

Doug
Doug, I rehydrate all the time now as I get more consistent fermentation that way. Its easy man.

Cool your beer, put in fermenter as usual. Rehydrate as per instructions. Use a timer. Once rehydration is complete, dump on wort, replace airlock. Done. When I do this I usually see fermentation start within 3-6 hours.
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Old 10-03-2010, 02:24 AM   #6
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Dumping your yeast into a cup of water while you're boiling your wort isn't all that hard to do. I sprinkled on the wort when I started then read about rehydrating and started doing that. Can't really say it's made much of a difference, but if something so easy gives my yeast a better chance at a good start, why not?

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Old 10-03-2010, 05:08 PM   #7
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For the life of me I can't figure out why there's a debate on this issue.

First, it's so painfully easy to rehydrate that there really is no excuse for not doing it. It requires no special equipment, and it can be done while awaiting the completion of other steps in the brewing process.

Second, both major manufacturers of dried yeast - Fermentis (SafAle) and Danstar - specify rehydration before pitching.

To me, that makes the whole thing a no-brainer. Just freakin' do it. Must you do it? Nope. But there's really no excuse. You don't have to change your socks, either.

Don't believe me, read the manufacturers' own info.

http://www.fermentis.com/FO/pdf/Tips-Tricks.pdf
http://www.danstaryeast.com/frequently-asked-questions
http://www.danstaryeast.com/library/...tips-ale-yeast

Cheers,

Bob

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Old 10-03-2010, 07:19 PM   #8
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For the life of me I can't figure out why there's a debate on this issue.
There's people who question hydrometer use and this surprises you?
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Old 10-03-2010, 07:27 PM   #9
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I agree with ya Bob, but I tend to be a "directions" type of guy and at least US-05 says to sprinkle into wort.

If I do that, I have one less thing to clean up later

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Old 10-03-2010, 07:39 PM   #10
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Maybe you can end the debate by splitting the batch. In one half just sprinkle a pack of yeast. In the other add the rehydrated yeast. Then tell us which starts first and turns out better and any difference in FG. That way the next time someone needs advice you can simply be the authority in the matter.

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