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Old 07-15-2010, 11:38 AM   #1
foles
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Jan 2010
Perth, AU
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I've started losing batches to a strange infection. Beer tastes pretty good towards the end of fermentation, but flavour is slowly stripped to leave a turbid, bland, unfresh tasting beer by the time it is kegged. This same pattern is evident. Only visual sign apart from the turbidity is the strange formation of the yeast cake in the fermenter. Yeast captured from the batch also forms these craters/bubbles.

Any idea what it is? I'm very thorough with sanitation, so its got to be a tough bug, or maybe something airborne.

Ive attached the pic link, but its not coming up for some reason.




Reason: cant get picture to attach

 
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Old 07-15-2010, 01:53 PM   #2
COLObrewer
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Jan 2009
Pea Green, Colorado
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The "craters" are quite possibly just co2 escaping, I've seen this, but it's hard to tell without a pic.

Did you do this: [IMG]Your pic link here[/IMG]

Keep on brewing my friends


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Old 07-15-2010, 02:04 PM   #3
Laughing_Gnome_Invisible
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Jan 2008
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Craters in the yeast cake is normal as stated above. (If it looks like I think it does) Infections usually show themselves on the surface, or in the beer itself.

 
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Old 07-15-2010, 02:26 PM   #4
XXguy
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Dec 2008
Southeastern PA
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I think the pic should be this one:
Click image for larger version

Name:	yeast craters.jpg
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Size:	77.1 KB
ID:	16452  

 
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Old 07-15-2010, 03:05 PM   #5
riverfrontbrewer
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Sep 2009
Denver, CO
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Good looking, healthy yeast cake doing it's job!

 
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Old 07-15-2010, 03:28 PM   #6
stealthninja
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May 2010
MI
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Quote:
Originally Posted by foles View Post

Ive attached the pic link, but its not coming up for some reason.

the reason the pic isn't showing up for you is that you are linking to the flickr page that contains the image (http://www.flickr.com/photos/9071460...n/photostream/) instead of the image itself ->
http://farm5.static.flickr.com/4073/...dd198d31f2.jpg

 
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Old 07-15-2010, 03:34 PM   #7
ChshreCat
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Aug 2008
Camano Island, Washington
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My yeast cakes almost always look like the surface of the moon after I rack the beer of 'em. I consider it a sign I was successful in racking all the beer off without disturbing the cake. It's just what's left behind when a big bubble of CO2 works it's way out of the cake.

 
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Old 07-15-2010, 03:35 PM   #8
TipsyDragon
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Mar 2009
California
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looks like bubbling yeast to me. the escaping CO2 made some CO2 volcanos. thats what it looks like to me.

 
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Old 07-15-2010, 07:57 PM   #9
Cpt_Kirks
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Sep 2008
Lakeland TN
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Quote:
Originally Posted by foles View Post
I've started losing batches to a strange infection. Beer tastes pretty good towards the end of fermentation, but flavour is slowly stripped to leave a turbid, bland, unfresh tasting beer by the time it is kegged.
That does not sound like an infection. That sounds like oxidation.

 
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Old 07-15-2010, 11:47 PM   #10
foles
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Jan 2010
Perth, AU
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Quote:
Originally Posted by Cpt_Kirks View Post
That does not sound like an infection. That sounds like oxidation.
Interesting....

Even without the sherry taste? I've tasted oxidised beers and it doesnt seem the same? But maybe an early oxidation tastes a bit different?

I've recently been using my silicon tube for racking into the keg - its a bit larger dia than than I should be using, so maybe its splashing the wort a lot more. But it seems to be turning before that stage. That leaves HSA (surely not)?




 
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