Coldbreak Brewing HERMS Giveaway!

HomeBrewSupply AMCYL Brew Kettle Giveaway!


Home Brew Forums > Home Brewing Beer > Fermentation & Yeast > How to calculate multi starter for slurry?
Reply
 
Thread Tools
Old 10-29-2010, 11:30 AM   #1
vanwolfhausen
Feedback Score: 0 reviews
Recipes 
 
Join Date: Mar 2008
Posts: 133
Default How to calculate multi starter for slurry?

Doing multi step starters with yeast packs has helped me alot. But, I would like to know how to do with slurry? I have month old US-05 and am gonna brew 10gallon batch next weekend. I only have 300mls and need almost 600mls slurry to make it work. I was going to guess and do a 1qt starter then 4 days later do a 3 qt starter and figured that would suffice? Anyone help me with this one?


vanwolfhausen is offline
 
Reply With Quote
Old 10-29-2010, 12:46 PM   #2
kanzimonson
Feedback Score: 0 reviews
Recipes 
 
Join Date: Aug 2009
Location: Charlottesville, VA
Posts: 2,169
Liked 42 Times on 38 Posts
Likes Given: 2

Default

I've been asking this question and can't really get a straight answer. I just play with the yeast calculator until I get some sort of logic that works in my head and then I go for it.

I'm thinking you may be able to go straight to a 3L starter. Put it this way: with an average gravity beer (1.050-1.060) and a yeast packet with "average age" (let's say a month old), you generally need to almost double the amount of yeast. Usually this means making a 1-2L starter. Your stats sound about the same, so I'd say you need to make a 3-4L starter with the yeast you have. Forget the step up.

Here's a thought process that might help: It sounds like your yeast is slightly older (a month or more?) so the calculator is spitting out 300mL for each batch. Remember, though, if you make a starter, you get to reset the viability back to 90-100%. So check to see how many mL you need of yeast if it were freshest. That's how much should be on the bottom of your flask after you make the starter.


kanzimonson is offline
 
Reply With Quote
Old 10-29-2010, 02:46 PM   #3
dstar26t
If it's worth doing, it's worth overdoing
HBT_SUPPORTER.png
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jan 2008
Location: Ridley Park, PA
Posts: 1,243
Liked 35 Times on 33 Posts

Default

I can run this through with you.

You're saying you need 600mL of month old slurry which I'm assuming you calculated from MrMalty's Pitching Rate Calculator (PRC for short). Just so I could use some numbers, I'm assuming you plugged into the slurry option: 10 gallons of a 1.088 Ale with month old slurry. That gives 597 Billion cells needed or 597 mL of your 46% viable month old slurry.

If you play with the numbers in the PRC, you find that when your 300mL of slurry was 100% viable, it had 652 Billion cells. You only have 46% of that which is 300 Billion cells.

Go to the Liquid Yeast tab and enter 300% for viability (since a 100% viable tube has 100 billion cells on average). Enter your other numbers (1.088, 10 gallons) and make sure the "# Vials or packs needed with starter" shows 1 and you get a 2.11 Liter starter required.
__________________
Next: Something Hoppy?
Fermenting: Doppelbock, DIPA, Egregious-ish, Barrel Fermented Dreg DelcoLambic, Sacch Trois Helles
Drinking: CAP, RIS, Jalapeņo RIS, Carrot Blossom Cedar Mead, Dusseldorf Altbier, Doppelbock, Cider, Rye Berliner Weisse, Sauerkraut Fermented Gose, Gueuze, Brett Blonde, Kriek, Saison, Sour Blonde
Barrel aged: RIS, Rye Barleywine, Tripel, Wee-Heavy
dstar26t is offline
2
People Like This 
Reply With Quote
Old 10-29-2010, 02:52 PM   #4
kanzimonson
Feedback Score: 0 reviews
Recipes 
 
Join Date: Aug 2009
Location: Charlottesville, VA
Posts: 2,169
Liked 42 Times on 38 Posts
Likes Given: 2

Default

You're my hero... I KNEW there had to be a way to use the calc to figure this out.

I'm sending you all my beer in thanks. It's in the mail.
kanzimonson is offline
 
Reply With Quote
Old 10-29-2010, 02:54 PM   #5
dstar26t
If it's worth doing, it's worth overdoing
HBT_SUPPORTER.png
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jan 2008
Location: Ridley Park, PA
Posts: 1,243
Liked 35 Times on 33 Posts

Default

I'll PM you my address
__________________
Next: Something Hoppy?
Fermenting: Doppelbock, DIPA, Egregious-ish, Barrel Fermented Dreg DelcoLambic, Sacch Trois Helles
Drinking: CAP, RIS, Jalapeņo RIS, Carrot Blossom Cedar Mead, Dusseldorf Altbier, Doppelbock, Cider, Rye Berliner Weisse, Sauerkraut Fermented Gose, Gueuze, Brett Blonde, Kriek, Saison, Sour Blonde
Barrel aged: RIS, Rye Barleywine, Tripel, Wee-Heavy
dstar26t is offline
 
Reply With Quote
Old 10-29-2010, 07:01 PM   #6
vanwolfhausen
Feedback Score: 0 reviews
Recipes 
 
Join Date: Mar 2008
Posts: 133
Default

That is great!! Thanks


vanwolfhausen is offline
 
Reply With Quote
Reply


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Starter Repitching from Slurry Question yournotpeter Fermentation & Yeast 6 07-03-2010 03:54 PM
Pitch full starter or just slurry? pretzelb Fermentation & Yeast 3 06-04-2010 06:13 PM
pitch on slurry vs starter kcinpdx Fermentation & Yeast 3 02-01-2010 07:26 PM
Old slurry vs. starter vs. Mr Malty Bizoune Fermentation & Yeast 1 11-29-2009 09:59 PM
Washed yeast slurry and starter size Bizoune Fermentation & Yeast 4 10-13-2009 10:26 AM


Forum Jump

Newest Threads

LATEST SPONSOR DEALS