3

Just a quick question on reusing yeast.

I am about to bottle a 40 pints of St-Peters cream stout this weekend I was going to save the yeast and use it again. I'm going to do a small 1 gallon batch of some dark beer very soon.

  1. Question is how much of the liquid reused yeast do i put in to 1 gallon??
  2. Is it worth doing is the second question.
  3. Does it take the same amount of time to ferment or is it faster as it is already liquid?

I know I said a question ended up being three . Thanks John

2

The generally specified amount is about 1/3 of a cup of yeast slurry into a 20 litre/5 gallon batch - so maybe 25ml, more?. This is all very rough, because you can never be sure of the concentration or viability of the yeast without putting it under a microscope. It's difficult to pitch too much yeast at the home brew level though, so I'd err on the side of more yeast.

If a "St-Peters cream" stout is a high-alcohol and therefore hard-work environment for the yeast, it may not be very healthy after fermentation. So if you just fermented a super-double-mega-imperial-table-beer, then maybe don't re-use the yeast.

As long as you can maintain a sanitary environment, there's no reason not to re-pitch healthy yeast. If your cream stout tastes weird at all, I would certainly not re-use the yeast then. Taste the beer before pitching its yeast.

I believe the "amount of time" you are referring to, is the post-pitch "lag phase" where the yeast is initially multiplying (and creating the bulk of the esters/flavours), before fermentation becomes noticeably vigorous. Pitching a good amount of healthy yeast will reduce this time.

| improve this answer | |
  • Hi.Thanks for the reply i thought it would have been a lot more than that im so glad i asked and not just gone a head and put the whole lot in. i will give it a go and let you know how i got on. Thanks again. John – John.C Apr 23 at 7:49
0

Years ago I got a growler (1/2 gallon?) of yeast from a local craft brewery when their fermentation was done. I pitched it in my 5 gal carboy and the beer came out great.

| improve this answer | |

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.