liquid yeast and spray malt

[Vossy1]

I was trying to find an easy answer to my question above but 2 hours after starting to read I'm more confused than ever

Thanks for the reply DaaB

Mr Malty says

'Wyeast ACTIVATORâ„¢ 125 XL Smack Pack both contain an average of 100 billion cells and are enough to pitch directly into 5 US gallons (18.9 liters) of an ale wort at 1.048 SG'

It then says

'In general, a two liter starter doubles the amount of yeast in a single vial or pack'

So why isnt that usable for a 10 gallon (US) brew @ 1048 SG...or is it

[Vossy1]

Is there a definition as to what constitues to stressing a yeast, ie, how much less yeast do you pitch?

It's all getting very technical now, I'm glad I built the HERMS 1st...looks like I got the easy bit out of the way

[Vossy1]

[Vossy1]

didn't read that properly, it may double the cells in an XL pack but that isn't enough to pitch into 10 imp gallons.

No, I know 10 imp gallons = 45.46 ltr / 3.785 US ltr = 12.01 US Gallons and hence my question about stressing the yeast....do you think it's close enough

[Vossy1]

I'm anticipating a 46 ltr batch at 1050.

Manually working it out, it needs around 414 billion cells, my malty says 421 billion and yet the Mr Malty also says a Wyeast pack made with a 2ltr starter is sufficient for a 1048SG brew of 10 US gallons

But Mr Malty then goes on to say that a 2ltr starter will double the yeast count to 200 billion cells, which is less than half what my batch needs, even with Gallon difference sizes, that's a big difference...despite his lab

So if I need a 4ltr starter, how do I go about it ?
Do I add an extra litre of malty water every 12 hours ish

[Chappie519]

I have sucsessfuly made a stir plate for £4.99!

But i have had to buy a erlynmyer flask and a stir bar which i now waiting on to arrive.

Im planning going to WL yeast too at the moment and have invested in the irish ale yeast. Its best before 28 this month, will it be allright to leave it a little longer?

Can one vial be made into a 1L starter and pitched to 50 UK ltrs? Or is there another way of doing it? Sorry if this has been asked already, maybe im blind but couldnt quite find the answer.

Chappie

[Chappie519]

Sorry Vossy if im hijacking - im confused about all this too!

[Vossy1]

If I was brewing 10 gals, i'd just go with the calculator, 1 sachet, 4L of wort and intermittent shaking. I wouldn't want to risk contamination due to excessive lag time for the sake of a few table spoons of extract and a couple of extra days. I'd probably go for a little more than 4 and continue the starter for future use.

Cheers DaaB

I'm planning on using this yeast on Saturday afternoon. I'll add the extra 3 litres of extract liquor tomorrow and see what happens.

Another simple but not so silly (in my eyes) question.

When I shake the pet bottle the C02 comes out of soln a fills the void above the yeast.

What I've been doing is taking the top off the bottle and purging the C02 by squeezing the bottle. I've then re-expanded the bottle, put the top back on and shaken like hell. I then take the top back off the bottle, squeeze it so little air is left in there, and then put the top back on.

Every time the bottle re-expands due to the yeasty critters I repeat.
Is this theory/practice o.k?

How do you aerate if it's in a demijon and full of C02

[Aleman]

Can I just point out that my 5L Starter, was made using a stir plate and Continuous aeration! Which according to the Mr Malty site produces more than enough yeast for 40L

[Chappie519]

What can i do with a 1 ltr flask and a plate stirrer in ways of making a starter from 1 vial of WL and adding to a 8 gallon batch?

[Vossy1]

Cheers DaaB

I've only just (1900hrs) managaed to put the 1ltr starter into the demijon with the other 3 ltrs of cooled worty mixture.
I remember reading SF saying that the yeast can double in 1 hour so overnight it should be where I want it.
I think the yeast will still be in suspension tomorrow for my brew, so what do I do?

Do I A, keep it for the next brew and let if fall out of suspension, or B, do I pitch the entire 4ltrs...or c, which I can't think of

[Vossy1]

Thank you once again....and my last question

Do I reduce the batch size to account for the starter

[Vossy1]

Magic