2

I washed some yeast ( US 05 ) from my last brew; and I now have 3 jars of yeast which separated out nicely overnight. They're around 2/3 yeast, 1/3 liquid at the moment, with no trub as far as I can see.

I want to use one of these next week and I'd like to know how much to use, so I went on to Mr Malty's calculator ( re-pitching from slurry tab ). There's a slider for "yeast concentration" which alters the result considerably. I know that within a week I definitely wont have a "Thin Slurry" at the lower end of the scale but how close to the upper end of the scale ( "Thick Yeast" ) would I likely be considering it will be a week settling in the fridge - or how would I go about estimating this.


enter image description here

1

Without doing a cell count using dye, microscope and hemocytometer. You really won't know the viable cell count. Otherwise it's all just guessing based on apperances and volumes.

I would just pitch a single jar in 5gal and get on with life.

  • Well I see what you're saying and it makes 100% sense to me but at the same time I looked again at the jars and they all have very different amounts of actual yeast in them - and one has double what another is for instance, and I'm new at all this too. Since there's a calculator there I might as well make use of it - based on your philosophy I think I might just take my own guess at the yeast concentration and err on the over-pitching side. – byronyasgur Nov 10 '16 at 19:22
  • @byronyasgur typically a slurry will settle into a couple layers bottom dark, middle cream, top liquid. This cream layer is your most viable yeast, you can use that visual for your % of yeast. To error on the side of over pitch is good. The majority of styles welcome an over pitch of yeast. – Evil Zymurgist Nov 11 '16 at 0:38
  • @byronyasgur also I would just assume 1bil cells per ml of healthy yeast. For example a can of imperial fresh liquid yeast only has 1.33b cells per ml – Evil Zymurgist Nov 11 '16 at 0:42

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.