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Paraphrasing "Yeast"

The first few moments of a Re-hydrating yeasts life is very important, until the cell wall is completely reconstituted it cannot regulate what goes through it. If it is Re-hydrating in wort the cell takes in too much and can kill or damage it.

Re-hydrating the yeast properly will yield ~70-75% viability

Re-hydrating in wort will yield ~45-50% viability.

F250

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Perhaps, but the manufacturers of dry yeast don't suggest re-hydrating, do they?

Rick

__________________
Primary - Big Pale Citra Ale (AG)(1.063)
Secondary - Bitter (AG)
Bottled - Best Bitter, Bitter, SNPA clone
On deck - Tank #7 clone.

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Well, they do but they figure most home brewers cannot handle it..

Check the spec sheet.

http://www.fermentis.com/wp-content/uploads/2012/02/SFA_US05.pdf

jakenbacon

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No they don't, and I trust the company that is making much more money than us and does this for a living. Read the manufactures instructions for the yeast your using, plain and simple.... That wasn't to you Rick, just quoted you for the 'yes or no' question....


.....Wow, appears fementis has changed the US-05 PDF, never had any hydrating options before, What the hell do I know...... (you do not have to answer that)....

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I was just about to respond, but held back

The flame wars were about to begin


The problem with not rehydrating is that the yeast kill can put you below optimal pitching rates and the only way to bring it back up is to throw in another package. If you like the KISS method just buy two packages.

For really big beers I buy two packages and rehydrate.


Just do a bit of research do not take my word for it.. you will find that lots of the top guys in homebrew preach rehydrating.

dlaramie08

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I have tried both rehydrating and pitching dry and have had no discernible flavor difference between the two. This is just my experience and does not constitute a scientific experiment. However I also pitch at appropriate temperatures when available, ie not in the summer time.

F250

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Interesting.

I usually use Fermentis or Danstar dry yeasts, as they happen to make good yeasts for the style of beers I like. To date I've always just sprinkled on top of the wort per the package instructions and not had issue, but the next time I brew something I'm familiar with I'll try re-hydrating and see if I notice a difference. I'm pretty familiar with Windsor and US-05, so they would be the logical candidates.

Rick

__________________
Primary - Big Pale Citra Ale (AG)(1.063)
Secondary - Bitter (AG)
Bottled - Best Bitter, Bitter, SNPA clone
On deck - Tank #7 clone.

jakenbacon

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Lucky you

BansheeRider

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No, we are talking about before pitching the yeast into the wort.

Sometimes on the packet it will recommend hydrating before use.

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He edited the first post