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Old 09-26-2013, 06:47 PM   #1
lelandmccann
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Default Yeast Starter

Hello all,

I just finished my homemade Stir Plate ($21 total) and it works awesome. Currently I only have a 1000ml Flask and my next batch calls for a 1l starter. The only negative thing I've read about making a 1l starter in a small flask is the chance of boil over, but I don't plan to boil in the flask as I have an electric stove. The stir plate creates a vortex well strong enough to stir 1l (I tested with food coloring).
So, can I make a 1l starter in a 1000ml flask?

Thanks!

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Old 09-26-2013, 07:02 PM   #2
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Go a little under. The issue when not boiling in the flask is the chance of kraussen overflow. If you want to get your exact cell count to what you need, you could do a 2 step starter. Do a 800ml one first and calculate your cell count. Then let it settle and dump the wort off the top out,, then do another starter with the correct amount of wort to get up to your desired pitching rate.

How many cells do you need to pitch?

What yeast are you using? Is there a production date and yeast cell count on it?

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Old 09-26-2013, 07:03 PM   #3
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With a stir plate you can make a 1 liter starter in a 1 liter flask. Would be a good idea to get a 2 liter flask. Soon you will run into a brew which will require a 1.5 liter starter. I use the shake method with 1 gallon pickle jar or a 48 ounce cottage cheese container on the stir plate.

You are very wise to not boil the starter wort on the stove top, even if you would have a gas range. The design of the flask is for creating a volcano boiling DME.

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Old 09-26-2013, 07:49 PM   #4
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Quote:
Originally Posted by finsfan View Post
Go a little under. The issue when not boiling in the flask is the chance of kraussen overflow. If you want to get your exact cell count to what you need, you could do a 2 step starter. Do a 800ml one first and calculate your cell count. Then let it settle and dump the wort off the top out,, then do another starter with the correct amount of wort to get up to your desired pitching rate.

How many cells do you need to pitch?

What yeast are you using? Is there a production date and yeast cell count on it?
I am using White Labs California Ale. Expiration is Dec. 19, so production would have been Aug. 19. Mr. Malty says 222 billion cells, and 2 vials in 1l of starter.
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Old 09-26-2013, 07:53 PM   #5
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Quote:
Originally Posted by lelandmccann View Post
I am using White Labs California Ale. Expiration is Dec. 19, so production would have been Aug. 19. Mr. Malty says 222 billion cells, and 2 vials in 1l of starter.
so you are using 2 vials in this starter? and need 222 bil cells? If so, you only need a 800ml starter and will be at the right numbers
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Old 09-26-2013, 07:55 PM   #6
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If you have it on hand, a drop of fermcap in the starter will keep the krausen down to a minimum.

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Old 09-26-2013, 07:58 PM   #7
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I also fill my 1L flask no higher than 800ml when making starters.

Krausen can be a real b*tch sometimes. I just spent the day babysitting 1.2L in a 2L flask of Allagash yeast. Every 30-60 minutes I had to knock the krausen down to keep from pushing out the foam stopper - PITA!!! It was like 10" of krausen throughout the day.

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Old 09-26-2013, 08:00 PM   #8
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so you are using 2 vials in this starter? and need 222 bil cells? If so, you only need a 800ml starter and will be at the right numbers
How are you calculating this? Is there a better tool than Mr Malty? It says 2 vials at 70% viability in 1L will achieve 222bil.
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Old 09-26-2013, 08:01 PM   #9
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Quote:
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How are you calculating this? Is there a better tool than Mr Malty? It says 2 vials at 70% viability in 1L will achieve 222bil.
yeastcalc.com

Thats about what I got too, except for 800ml. How many cells do you need to pitch?
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Old 09-26-2013, 08:04 PM   #10
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Originally Posted by finsfan View Post
yeastcalc.com

Thats about what I got too, except for 800ml. How many cells do you need to pitch?
Not exactly sure. Both calculator tools have said 222bil. I'm making the NB Jamil's Evil Twin Extract. OG of 1.064.
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