How much yeast is lost during blow-off? - Home Brew Forums
Home Brew Forums > Home Brewing Beer > Fermentation & Yeast > How much yeast is lost during blow-off?
Cool Brewing Giveaway - Supporting Membership Drive & Discount

Reply
 
Thread Tools
Old 02-11-2010, 09:18 PM   #1
Schnitzengiggle
Recipes 
 
Feb 2009
Tucson, AZ
Posts: 2,558
Liked 31 Times on 23 Posts



I made a 2qt starter on Tuesday, and stepped it up to 4qt on Wednesday afternoon right about at high kraeusen. The Temperature has been at a steady 67. The yeast is first generation washed WLP004 and will be for a 10 gallon batch of a Sweet Stout. It has been in the fridge for at least 6 months. I suspected I was going to have a blow off, but this thing volcanoed for a few hours before the krauesen fell.

Here is the starter, I got home about 5 hours after pitching the 2qt step-up.


I had a huge foil dome over the top of it (removed for photo) since there was no way a foil cap was staying on. Although, I think that the yeast in there would out compete any predators trying to invade.





I was wondering how much yeast is lost during a blow-off, and of what quality the yeast is (ie. more/less flocculent)?.

My starter is on a stirplate, so I'm assuming that since all the yeast is in suspension, the blow off contains all types of cells (more and less flocculent).

Could someone throw out a number in percentages maybe the quantity of viable cells lost, and the quality of those cells?

FWIW, I need to get a 5L flask, however, even with the additional 1L of headspace, I think I would have still had an eruption.


__________________
follow me @ Broken Glass Brewery

Okham's Razor - simplest explanation is usually the correct one.

My DIY Kegerator - My DIY Fermentation Chamber - My DIY Portable Pump Box

Reason: grammatical error.

 
Reply With Quote
Old 02-11-2010, 09:28 PM   #2
david_42
 
david_42's Avatar
Recipes 
 
Oct 2005
Willamina & Oak Grove, Oregon, USA
Posts: 25,576
Liked 148 Times on 139 Posts


A meaninglessly small percentage. Weight the foam and compare it to the weight of the starter.


__________________
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"

"I would like to die on Mars, just not on impact." Elon Musk

 
Reply With Quote
Old 02-11-2010, 11:05 PM   #3
droopy
Recipes 
 
Dec 2004
Posts: 69
Liked 3 Times on 2 Posts


its a total loss. Better give it to me.

 
Reply With Quote
Old 02-11-2010, 11:23 PM   #4
Montanaandy
Recipes 
 
Oct 2009
Montana
Posts: 997
Liked 19 Times on 14 Posts


Can't tell you how much yeast is lost during a blow off but from the sounds of the size of your starter and the looks of how active it is you should be fine.

BTW - I like the juxtposition of the diffuser on top of the toilet tank with the frothing starter. Looks like something one would see in a modern art gallery

Montanaandy

 
Reply With Quote
Old 02-11-2010, 11:24 PM   #5
Schnitzengiggle
Recipes 
 
Feb 2009
Tucson, AZ
Posts: 2,558
Liked 31 Times on 23 Posts


Quote:
Originally Posted by droopy View Post
its a total loss. Better give it to me.
Alright, I'll send you the foam.

Quote:
Originally Posted by Montanaandy View Post
BTW - I like the juxtposition of the diffuser on top of the toilet tank with the frothing starter. Looks like something one would see in a modern art gallery
Montanaandy
I never even thought of that when taking the photo, but now that you point it out...

It does smell quite good in there, the starter totally overpowers the diffuser


__________________
follow me @ Broken Glass Brewery

Okham's Razor - simplest explanation is usually the correct one.

My DIY Kegerator - My DIY Fermentation Chamber - My DIY Portable Pump Box


 
Reply With Quote
Reply
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
wort / yeast lost during blow off jiggs_casey Beginners Beer Brewing Forum 1 12-27-2009 01:52 AM
Lost volume out blow off tube psychobrawler Fermentation & Yeast 4 12-16-2009 05:31 PM
lost .25 gal to blow off yeasty Beginners Beer Brewing Forum 5 05-28-2009 12:33 AM
Urgent: Lost my Blow Off Tube dipflop Beginners Beer Brewing Forum 10 03-06-2008 02:30 AM
blow-off = yeast lost? dubbel dutch Beginners Beer Brewing Forum 7 10-06-2007 04:08 AM


Forum Jump