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Home Brew Forums > Home Brewing Beer > General Beer Discussion > Rehydrating dry yeast?
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Old 08-29-2012, 11:59 PM   #1
RauelDuke
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Default Rehydrating dry yeast?

So i am curious does rehydrating dry yeast really make a difference? Is it like making a starter for liquid yeast?


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Old 08-30-2012, 12:03 AM   #2
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The book "Yeast" says that as much as 50% of dry yeast dies if you don't rehydrate it first. They said it is because waking up in wort is too much of a shock compared with straight water. That's a good enough reason for me to rehydrate.


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Old 08-30-2012, 12:26 AM   #3
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Follow directions on the dry yeast packet.
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Old 08-30-2012, 12:45 AM   #4
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Rehydrate in 85-90 water for 20 minutes. Then stir and add a Tsp of OJ. Rest another ten minutes, stir and pitch!
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Old 08-30-2012, 12:54 AM   #5
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never heard of adding a tablespoon of orange juice... what does that do?

i sometimes add small quantities of the wort to the rehydrated yeast after 20-30 minutes. i start off with a few spoonfuls, might end with adding a half-cup after some time. my unscientific thought is that this allows the yeast to start adapting to the sugary environment before taking the Big Plunge.
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Old 08-30-2012, 12:54 AM   #6
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Yes, generally dry yeast should be rehydrated, but no starter.

When in doubt, go with the manufacturers recommendations. Most of them have quite good info available on the web. I always make it a point of reading their specs and recommendations -- especially before using or even ordering a new yeast.
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Old 08-30-2012, 12:58 AM   #7
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I rehydrate and pitch. I wouldn't add OJ. I don't think it's enough to make a difference but if you feed the yeast simple sugar it loses the ability to metabolize more complex sugars.
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Old 08-30-2012, 03:00 AM   #8
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Boil water, cool, once below 90 drop in yeast for 20 minutes. Before pitching put spoonfuls of wort into the yeast - same as you would do when tempering an egg mixture... (balancing the temp to not cook the egg/shock the yeast. When it's within a few degrees of the rest of the wort, pitch.
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Old 08-30-2012, 03:48 PM   #9
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This is a pretty good video on how to re-hydrate yeast.
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Old 08-30-2012, 04:09 PM   #10
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+1 for the vid - It is similar to the one I used the first time.

Also, as far as does rehydrating make a difference, I have to say YES. The one time I did this, fermentation took off when comared to the 'ole sprinkle and seal.


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