Using two step propagation yeast starter

Northern Brewer General
1

When should you use this?

Thanks,

Brent

2

[quote=“brentconn”]When should you use this?

Thanks,

Brent[/quote]

When a 1 step starter won’t build up to the required cell count needed for the OG of your wort.

Have you looked at any of the yeast calculators? This is the one I use most often http://www.brewersfriend.com/yeast-pitc … alculator/

3

[quote=“brentconn”]When should you use this?

Thanks,

Brent[/quote]
When you have very old yeast and make your first starter with an OG of 1.005 or 1.010 to prevent stressing the yeast.
When you are brewing a lager and need double the pitch rate of an ale of the same OG.
When the starter container is to small for a single step starter.

There are most likely other reasons also.