Harvesting lager yeast from a corny keg

Homebrew Talk - Beer, Wine, Mead, & Cider Brewing Discussion Forum

Help Support Homebrew Talk - Beer, Wine, Mead, & Cider Brewing Discussion Forum:

McMullan

wort maker
HBT Supporter
Joined
Dec 22, 2015
Messages
1,884
Reaction score
2,391
Just thought I'd share this, in case anyone wants to try something similar. I usually top-crop ale yeast. Harvesting lager yeast for repitching is something new for me. I'm hoping to get a better fermentation repitching more healthy yeast🤞

So, I don't drink much lager, but I've been enjoying a personal challenge to make some I'd be happy to serve, especially during the hot summer months. Basically, I've been brewing half batches and fermenting them in what were redundant 19L corny kegs. After transferring the beer to a 9L keg for lagering, the remaining small volume of beer was tapped off until the keg 'blew'. I gave the keg a good swirl then put it on its side, tilted towards the top with the gas post at 6 o'clock. Left it sitting there for a while, maybe 30 minutes or so, before connecting a collection bottle. I use a floating dip tube for beer out and a shortened gas dip tube so I can drain all sanitiser from the keg. I realised the shortened gas dip tube is going to help collect yeast slurry, too. Well, some pictures explain it better:

DSC_0020.JPG

DSC_0021.JPG


Concentrated active yeast slurry under CO2 (no oxygen) stored in the fridge, ready for repitching tomorrow.
 

odie

Well-Known Member
Joined
Dec 18, 2016
Messages
2,019
Reaction score
1,133
Location
CC, TX
genius...I gave up harvesting keg fermented yeast when I switched to a floating dip tube.
 

beerfactory

Well-Known Member
Joined
Dec 17, 2007
Messages
176
Reaction score
91
Location
NWA
this is genius - much more sanitary than what I am doing, which is a Winco Stainless Steel Ladle, 5-Ounce and canning jars
 
OP
OP
McMullan

McMullan

wort maker
HBT Supporter
Joined
Dec 22, 2015
Messages
1,884
Reaction score
2,391
Why not just open the lid and pour the yeast slurry into a sanitized container?
Dribbling concentrated slurry from a corny keg is a PITA, if you ask me. The method here worked very well for me and I'll carry on using it for harvesting lager yeast from half batches fermented in a corny keg. There's not really much setting up either. What you see is the set-up for spunding when the keg is upright. And the pressure to push the slurry out is already in the keg. Why not use? I like that the method collects concentrated slurry (no beer carryover) under CO2, too, which probably keeps the yeast happier for longer than air.
 

Brooothru

Well-Known Member
Joined
Feb 16, 2012
Messages
2,314
Reaction score
2,226
Location
Either in the brewery or on the road
Here's the shortened 'gas' dip tube, with a standard gas dip tube.

View attachment 762047

Without any protrusion inside the keg the gas/in post gets a lot more useful. Not just for harvesting yeast, but draining excess sanitiser too.

Cool trick. I'll use this to harvest from a kegmenter. Thanks.
 
Top