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General Category => General Homebrew Discussion => Topic started by: yso191 on June 27, 2013, 08:44:27 pm

Title: Wort stability test
Post by: yso191 on June 27, 2013, 08:44:27 pm
I decided to do my first ever wort stability test on this last brew.  As I understand it 3 days is a passing grade.  Mine went five!

I'm wondering what your longest is.
Title: Re: Wort stability test
Post by: oly on June 27, 2013, 09:03:40 pm
What is a wort stability test?
Title: Re: Wort stability test
Post by: bboy9000 on June 27, 2013, 10:05:12 pm
A wort stability test is a way to test your brewery sanitation practices.  Take some boiled and cooled wort, put it in a covered sanitized container (I use a glass horseradish jar) then set it somewhere warm.  It should go three days without going sour, making CO2, developing bacteria and mold, etc.  If not you probably have something contaminating your wort (dirty chiller, tubing).  See the following from Wyeast:

http://www.wyeastlab.com/com-qc.cfm
Title: Re: Wort stability test
Post by: rjharper on June 28, 2013, 07:20:09 pm
Hmm. I'll need to try this on my next batch. Pour off a pint or so into a sanitized mason jar and see what happens.
Title: Re: Wort stability test
Post by: HoosierBrew on June 28, 2013, 07:47:33 pm
I'm brewing Sunday morning.  Think I'll give it a try. 
Title: Re: Wort stability test
Post by: tygo on July 01, 2013, 10:05:03 am
I do it periodically to check my sanitation practices pre-ferment.  I usually am able to go seven days with no visible activity and no drop in gravity. 
Title: Re: Wort stability test
Post by: joe_feist on July 01, 2013, 10:27:55 am
I've not done this before, but it's on the list for my next batch. I don't typically have contamination isues that I notice...but maybe they're small problems that I'm just not picking up on. I think this test is a great idea and it really doesn't cost much. I imagine just a cup of wort in a Ball jar would be plenty, right?
Title: Re: Wort stability test
Post by: tygo on July 01, 2013, 10:36:35 am
I imagine just a cup of wort in a Ball jar would be plenty, right?

Yep
Title: Re: Wort stability test
Post by: Jimmy K on July 01, 2013, 11:11:27 am
I imagine just a cup of wort in a Ball jar would be plenty, right?

Yep
Enough to fill a hydrometer tube I bet. Probably less needed if you have a refractometer.