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Starter for Dunkel

I have 375ml of 2206 slurry from 9/24/14. I want to brew a dunkel 1.056 OG on Wednesday.

Since I’ve waited so late to make the starter my only option is to make it about 12 hours before I brew and pitch the whole starter at high krauesen.

With a one step 2L starter I would need 3 new packs of yeast according to mrmalty.

MrMalty says my slurry is only 10% viable. At the highest concentration of yeast it says I need 1100ml of slurry.

Yeastcalc using the middle of the road concentration of yeast and mid range trub says I need 230ml of ‘washed yeast.’ Yeast calc doesn’t account for the age of the ‘washed yeast?’

So I’m thinking of making a 2.5L starter and pitching the 375ml of slurry to it then pitching the starter at high K.

Opinions?

Hmmm. I hope I’m not heading you in the wrong direction, but on Saturday I pitched a 500ml slurry of 1056 that I saved on 9/22 directly into a pale ale at the same OG as yours and it’s going nuts right now. So I’d say you’re probably safe pitching your slurry into a 2.5l starter as you propose.

If it were an ale I’d have no concerns. I’m just concerned if it’s going to produce enough cells for a lager.

I put your basic numbers in Brewers Friend calculator. 5.5 gallons 1056 OG 1 billion per ml 62% viability Pro Brewer 1.5 lager target 431 billion cells 1.5 liter starter 436 billion cells

You may have a greater cell density if the slurry is very clean.

http://www.brewersfriend.com/yeast-pitc ... alculator/

[quote=“flars”]I put your basic numbers in Brewers Friend calculator. 5.5 gallons 1056 OG 1 billion per ml 62% viability Pro Brewer 1.5 lager target 431 billion cells 1.5 liter starter 436 billion cells

You may have a greater cell density if the slurry is very clean.

http://www.brewersfriend.com/yeast-pitc ... alculator/[/quote]

Thanks Flars!

That’s the yeast calculator I was looking for. Couldn’t remember where I’d seen it.

So you get the viability percent from the date as if it were a new yeast pack? How do you factor in viability when you’re using slurry?

Yes. I get the viability % as if it were a pack of liquid yeast. In the case of your yeast production date of 9/24, the viability was 62%. I multiplied the 375 ml of yeast slurry on hand by 0.62, to approximate the number of viable cells in the 375 ml. I entered .232, 62% of 375, liters of slurry to calculate the starter size.

Gotcha! Thanks!

I just ‘wing it’ for pitching slurry to ales and it’s always worked out but I want to be sure I’m pitching enough for my lagers.

So you get the viability percent from the date as if it were a new yeast pack? How do you factor in viability when you’re using slurry?


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