This weekend, I brewed a repeat batch of the same beer that I bottled earlier in the day, so I just dumped the new wort on the old yeast cake (Safale 05). The airlock on the new beer began showing activity within hours and fermentation was rolling along within 12 hours.
This was the first time I re-used a yeast cake and I was impressed with the time it saved me. (I didn't even have to wash the fermenter from the first batch. For my next batch, I will be brewing a darker, stronger beer, so I believe that I can again re-use the yeast cake. Since it will now be two generations in, however, I am wondering if I should scoop out some of the trub/yeast from the bottom before adding the new wort (using a sanitized measuring cup). Has anyone ever done this?
This was the first time I re-used a yeast cake and I was impressed with the time it saved me. (I didn't even have to wash the fermenter from the first batch. For my next batch, I will be brewing a darker, stronger beer, so I believe that I can again re-use the yeast cake. Since it will now be two generations in, however, I am wondering if I should scoop out some of the trub/yeast from the bottom before adding the new wort (using a sanitized measuring cup). Has anyone ever done this?