Can I dump new wort on old yeast?

Can I dump new wort on old yeast?

Post by fr.. » Thu, 26 Feb 2004 12:16:09



Following is part of an answer I got to a fermenter question.

"One benefit with using a secondary fermenter is that you can make a
New batch of wort the day you rerack your first batch, and dump the
new batch on-top of the yeast in the primary fermentor ~ talk about a
HUGE starter...instant fermentation :)"

Is this true?
I had thought that the trub on the bottom of the bucket was "dead"
yeast "bodies?" and that leaving them in contact with the wort would
impart off flavors.

Assuming I transfer from the primary fermenter after 5-7 days, would
the remaining trub contain "the mother of all yeast starters"?
Would I then be able to dump in a new wort mix and continue on my very
merry way?
Assuming of course that the wort was compatible with the existing
yeast "starter"

Thanks
Frank

 
 
 

Can I dump new wort on old yeast?

Post by SWalter » Thu, 26 Feb 2004 12:53:06


Quote:

> Is this true?
> I had thought that the trub on the bottom of the bucket was "dead"
> yeast "bodies?" and that leaving them in contact with the wort would
> impart off flavors.

Yes it is true and the yeast cells are not dead but actually kind of
dormant. The yeast cells drop like that after all fermentable sugars
have been consumed (if you will.) If you add more fermentable sugars
they will come out of dormancy and go back at it.

Quote:

> Assuming I transfer from the primary fermenter after 5-7 days, would
> the remaining trub contain "the mother of all yeast starters"?
> Would I then be able to dump in a new wort mix and continue on my very
> merry way?
> Assuming of course that the wort was compatible with the existing
> yeast "starter"

I've done this a few times now and I've found the best thing to do is
dump some of the trub out then swirl the carboy. After doing this dump
the remaining yeast into a sanitized growler (or jar of some sort.) Then
clean/sanitize the carboy and prior to putting in the new beer pour the
yeast sediment back into the carboy.

You will not want to do this for more than 2-3 brews and even less if
the brew is higher gravity as BIGGER beers put additional strain on the
yeast.

One way of getting an extra brew out of used yeast is I end up doing
what I explained above but using two different jars. One which I'll use
right away and the other will go in the fridge with some aluminum foil
over the jar for later use.

Oh...it's also a good idea to plan your brewing out so that the next
beer that you'll make from the yeast cake prior will be a higher
gravity. ex... I'd use a California Yeast to brew a Cream Ale the use
the yeast cake to brew an IPA (1.060-70) then use that yeast cake to
brew a barley wine (1.080-100.) After this you should just dump the
remains.

 
 
 

Can I dump new wort on old yeast?

Post by Todd Enlun » Thu, 26 Feb 2004 13:32:38


I always do just this when I make a Barleywine.  I'll be doing another
batch of Neuralyzer later this week... prolly Friday.

Nothing get a Barleywine kicking like a 5 gallon starter :-)

Quote:

>Following is part of an answer I got to a fermenter question.

>"One benefit with using a secondary fermenter is that you can make a
>New batch of wort the day you rerack your first batch, and dump the
>new batch on-top of the yeast in the primary fermentor ~ talk about a
>HUGE starter...instant fermentation :)"

>Is this true?
>I had thought that the trub on the bottom of the bucket was "dead"
>yeast "bodies?" and that leaving them in contact with the wort would
>impart off flavors.

>Assuming I transfer from the primary fermenter after 5-7 days, would
>the remaining trub contain "the mother of all yeast starters"?
>Would I then be able to dump in a new wort mix and continue on my very
>merry way?
>Assuming of course that the wort was compatible with the existing
>yeast "starter"

>Thanks
>Frank

--

Todd Enlund
http://www.photografik.net/lonelyneuron/

     "Bandits at 3 O'Clock"
     "Roger.  What should I do 'till then?"

 
 
 

Can I dump new wort on old yeast?

Post by John 'Shaggy' Kolesa » Fri, 27 Feb 2004 00:14:36


Quote:

> Following is part of an answer I got to a fermenter question.

> "One benefit with using a secondary fermenter is that you can make a
> New batch of wort the day you rerack your first batch, and dump the
> new batch on-top of the yeast in the primary fermentor ~ talk about a
> HUGE starter...instant fermentation :)"

> Is this true?

Yes.

Quote:
> I had thought that the trub on the bottom of the bucket was "dead"
> yeast "bodies?" and that leaving them in contact with the wort would
> impart off flavors.

Nope.  I wouldn't leave the second batch in the primary for a month or so,
but a week for primary fermentation should not be a problem.

Quote:
> Assuming I transfer from the primary fermenter after 5-7 days, would
> the remaining trub contain "the mother of all yeast starters"?
> Would I then be able to dump in a new wort mix and continue on my very
> merry way?
> Assuming of course that the wort was compatible with the existing
> yeast "starter"

Yep, many people keep reusing yeast like this.  You don't want to go forever
this way.  It'll build up more and more trub, and the yeast will eventually
mutate.  But doing several similar beers in a row is a great way to cut down
the cost of yeast.

John.

 
 
 

Can I dump new wort on old yeast?

Post by joe » Fri, 27 Feb 2004 02:29:45




Quote:

> > Following is part of an answer I got to a fermenter question.

> > "One benefit with using a secondary fermenter is that you can make a
> > New batch of wort the day you rerack your first batch, and dump the
> > new batch on-top of the yeast in the primary fermentor ~ talk about a
> > HUGE starter...instant fermentation :)"

> > Is this true?

> Yes.

> > I had thought that the trub on the bottom of the bucket was "dead"
> > yeast "bodies?" and that leaving them in contact with the wort would
> > impart off flavors.

> Nope.  I wouldn't leave the second batch in the primary for a month or so,
> but a week for primary fermentation should not be a problem.

> > Assuming I transfer from the primary fermenter after 5-7 days, would
> > the remaining trub contain "the mother of all yeast starters"?
> > Would I then be able to dump in a new wort mix and continue on my very
> > merry way?
> > Assuming of course that the wort was compatible with the existing
> > yeast "starter"

> Yep, many people keep reusing yeast like this.  You don't want to go
forever
> this way.  It'll build up more and more trub, and the yeast will
eventually
> mutate.  But doing several similar beers in a row is a great way to cut
down
> the cost of yeast.

> John.

but this would mean i would have to brew every weekend!? whatever shall i
do!??!
 
 
 

Can I dump new wort on old yeast?

Post by Dr. Richard E. Hawki » Sat, 28 Feb 2004 07:44:22



Quote:

>I've done this a few times now and I've found the best thing to do is
>dump some of the trub out then swirl the carboy. After doing this dump
>the remaining yeast into a sanitized growler (or jar of some sort.) Then
>clean/sanitize the carboy and prior to putting in the new beer pour the
>yeast sediment back into the carboy.
>You will not want to do this for more than 2-3 brews and even less if
>the brew is higher gravity as BIGGER beers put additional strain on the
>yeast.
>One way of getting an extra brew out of used yeast is I end up doing
>what I explained above but using two different jars. One which I'll use
>right away and the other will go in the fridge with some aluminum foil
>over the jar for later use.

When I'm up to speed, I use 22 oz bottles and canned 8oz wort.  Feed the
"culture" both 1-3 days before brewing (depending upon temperature and
how long it's been) and immediately upon pouring most of the yeast into
your new beer.

In Las Vegas, I kept these going as long as a year before they went
bad--and that happened from forgetting to feed them after brewing (it
flushes the air out).  Here, they always seem to get knocked over . . .

hawk
--
Richard E. Hawkins, Asst. Prof. of Economics    /"\   ASCII ribbon campaign

These opinions will not be those of              X    and postings.
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