[Jefferson Coastal]

I have never done this before, however considering.   Brewed a Marzen and will be racking it off to a secondary.   The beer is being fermented in a 5 gallon glass carboy.   My next beer will be a Doppelbock

- Would it be best to siphon off as much beer (& trub) as possible, and then rack the fresh new wort on top the existing yeast cake (& any residual)

- After siphoning how long could I safely keep the yeast cake as is, before adding the new wort?   Eg 3 days, 5 days more?

Thanks for the advice.

[erockrph]

The beer is protective for the yeast. When I do this I rack the old beer off right before racking the new beer on the cake. If I can't do it the same day, I usually transfer the yeast to a few mason jars (with a small amount of the beer) and keep them in the fridge until I can use them.

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[Kevin]

When I do this I plan my brews so that brew #2 is ready to go on the yeast the very same day that brew #1 is being kegged. If there is going to be any delay of a day or more I collect the yeast cake in a quart mason jar and store it in the refrigerator. I have kept jars for three or more weeks like this before using with no problems.

[tommymorris]

When you do this do you worry about the ring of Brown hop matter stuck to the side of the fermenter? Batch two will naturally submerge that stuff and I hear it is pretty bitter. No negative side effects?

[denny]

When you do this do you worry about the ring of Brown hop matter stuck to the side of the fermenter? Batch two will naturally submerge that stuff and I hear it is pretty bitter. No negative side effects?

Not that I've experienced