How Much Yeast Slurry To Use

[spudfarmerboy]

I harvest a few jar fulls of yeast slurry from my fermenter when using liquid yeasts such as 1469 and 1968.
They sit in the fridge sometimes for 6 months before I use them in a starter.
My question is, how much slurry should I use in a 1 litre or 1 1/2 litre starter?
Also, if brewing a 23 litre batch, how big a starter should I make for an ale with a starting gravity of around 1050?
Cheers all.

 

[Duff]

Mr Malty is your friend:

Click here

 

[Wolfy]

As per the info about yeast viability over time on MrMalty, after even just a few weeks your yeast health and viability drops so much that the 'amount of slurry' is not the issue, but rather the size of the starter you make. Too much of the yeast will be dead not to make a starter, so use some of the slurry and then use a calculator to determine the size of the starter you need.