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Old 09-18-2010, 06:02 AM   #1
Sep 2005
Loveland, CO
Posts: 100

I mixed up Star San using RO water November of '09. Sto;red it in a bucket w/tight fitting lid. Opened it to sanitize bottles - it was clear. Don't have any ph strips. Is it still good if it is clear. I believe the Star San site makes this claim.
Primary: MT
Secondary: Belgian Wheat
Consuming: EdWort's Apfelwein,

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Old 09-18-2010, 11:12 AM   #2
Apr 2008
New Jersey
Posts: 1,093
Liked 37 Times on 33 Posts

Did it foam up?
I would think if it did you'd be good.

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Old 09-18-2010, 11:34 AM   #3
bullinachinashop's Avatar
Oct 2009
NE Ohio
Posts: 1,046
Liked 30 Times on 27 Posts

Do ya feel lucky!


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Old 09-18-2010, 03:36 PM   #4
Scut_Monkey's Avatar
Jan 2009
Pittsburgh, Pennsylvania
Posts: 2,656
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Really the only way to know is by checking the pH. The clarity of it is not a true indicator of it's pH.

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Old 09-18-2010, 04:29 PM   #5
Dec 2006
Posts: 473
Liked 19 Times on 15 Posts

What can happen to it in a closed bucket? It's a mixture of water, phosphoric acid and sodium docecyl benzene sulfate. All are stable chemicals for long term storage. There are no chemical reactions that take place in the mixture. I keep mine for months at a time in a plastic pail with a cover, and it stays clear and foams up, I have not checked the pH but will do so. I do take care not to put reused Starsan back in the bucket if I think it might have gotten some organic matter in, like wort.

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Old 09-18-2010, 09:16 PM   #6
rico567's Avatar
Apr 2008
Central IL
Posts: 3,018
Liked 87 Times on 81 Posts

A big +1 on what "Scut Monkey" said. Checking a sanitizer visually is akin to determining the end of fermentation by looking at the wort. If you like these methods, you'd probably also enjoy Las Vegas.

Pragmatically, I put aside most of a gallon jug of Star San solution last Fall when I quit brewing for Winter. When I checked it in the Spring (yes, Virginia, with pH test strip) it was just peachy-fine, < 3 pH. I might note that I mix Star San only with the RO (reverse osmosis) water from the supermarket, due to the high concentration of calcium and iron in our well water.
“Malt does more than Milton can / To justify God’s ways to man”

-A. E. Housman (1859–1936). A Shropshire Lad , 1896.

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