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hopster54
Joined: 11 May 2014 Posts: 188 Location: Vancouver, Canada
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Link Posted: Fri Aug 28, 2015 5:13 pm Post subject: stepping up a starter |
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I bought a new smack pk of wyeast 2124 Bohemian lager yst and stepped it up twice with 1.040 wort,i let it crash and was wondering if this 2 step starter is enough yst to brew a 10 gallon batch of Bohemian Pilsner?
I hope to brew Kals Bo Pilsner tomorrow, both step ups were made with 2 gallons of wort.
Thanks in advance for comments.
Hopster54
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Funkalizer
Joined: 12 Aug 2014 Posts: 11
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hopster54
Joined: 11 May 2014 Posts: 188 Location: Vancouver, Canada
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Link Posted: Sat Aug 29, 2015 2:50 pm Post subject: |
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Thanks for the link and the reassurrance funkaliser.
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kal Forum Administrator
Joined: 12 Dec 2010 Posts: 11116 Location: Ottawa, Canada
Drinking: Pub Ale, Electric Creamsicle, Mild, Pliny the Younger, Belgian Dark Strong, Weizen, Russian Imperial Stout, Black Butte Porter
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hopster54
Joined: 11 May 2014 Posts: 188 Location: Vancouver, Canada
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Link Posted: Tue Sep 01, 2015 5:57 pm Post subject: |
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Thanks again funkalizer & Kal.
Didnt get to brew this past weekend as we had a major windstorm blow in and knocked trees down all over,it looks like a war zone outside with debree absolutely everywhere,no power for 3 days,ripped down my hops,the hops that didnt get ripped down were stripped of leaves from the bottom up to mid height,cones all over.
Will have to harvest the ones that are on the bines when i get things cleaned up,raining today so decided to do some cleaning on brew equipment in hopes that i can get to brew the Czech pilsner later in the week.
Thanks again.
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David_H
Joined: 13 Nov 2013 Posts: 139 Location: Savannah, GA
Drinking: Dry Irish Stout, Electric Pale Ale, American Amber Ale, Irish Red Ale
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Link Posted: Wed Sep 30, 2015 6:16 pm Post subject: |
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I assume this is already fermented and almost ready to drink.
But here are my thoughts and calculations.
The yeast growth is limited by the amount of sugar available in the wort.
One gallons in about 4 Liters and in 4 Liters of 1.040 there is about 400 grams of DME. Yeast will reproduce like crazy until they run out of food. The saturation point is about 2B cells per 1 gram of DME, so in your first 1 gallon starter, irrespective of how much yeast you started with your final cell count would be about 2B/g x 400 g = 800B. The general consensus cell count per 5 gallons is 200 B, so you had plenty.
If you pitched all of the yeast from the first batch in the second 1 gallon batch you probably got very limit increase in the cell count. Most of the sugar in the second starter was used to just maintain the yeast you pitched.
This information is based on this article by Kai Troester: (http://braukaiser.com/documents/Troester_NHC_2013_Step_Up_Your_Starter.pdf)
David
_________________ David
Kal Clone Controller
20 gallon Spike Brewing 3-Kettle System
SS Brewtech 14 gallon fermenter w/ gycol chiller
4 tap keezer with Nitro Tap
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