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Old 12-06-2012, 08:05 PM   #1
philosofool
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Default Shelf life of prepared Starsan

I recently decided to try Starsan instead of Iodaphor as my sanitizer. I would like to rack a beer tonight and I'm brewing tomorrow. If I mix 5 gallons of Starsan tonight, will it still be viable tomorrow?

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Old 12-06-2012, 08:22 PM   #2
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Most likely.

I have highly alkaline water, so I always mix my starsan with distilled water so I can store it. Otherwise it will quickly go bad as the pH rises.

StarSan is effective at 3.6 pH and lower IIRC. As long as your water doesn't cause it to drop below this point you should be good. You could mix it a little strong to be sure.

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Old 12-06-2012, 08:23 PM   #3
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Oh, StarSan will get cloudy when it starts to go bad too. I don't know the chemistry behind that, but I know if I don't use distilled water my StarSan will get cloudy in a day or so.

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Old 12-06-2012, 11:07 PM   #4
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StarSan with distilled water can last for a crazy amount of time.
I mixed up 5 gallons that I store in a corny keg. 6 months later, it was still clear and reading 2.3 ph.
I finally made a fresh batch just because.

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Old 12-07-2012, 12:39 AM   #5
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Starsan using tap water is good for a min of 2 weeks.

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Old 12-07-2012, 12:59 AM   #6
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I've been using the same bucket of Starsan since September. I never quite trusted when people said it would last a long time, but then I ran out of Starsan and haven't bought a new bottle. So, I have forced myself to keep using what I've got. Haven't had any problems yet. Maybe after the holidays I'll get around to buying a new bottle of the stuff.

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Old 12-07-2012, 01:22 AM   #7
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When I mix starsan with my tap water and I get about a month out of it. It clouds up in about a minute or so but I test the PH before each use to make sure it's good.

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Old 12-07-2012, 02:11 AM   #8
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Quote:
Originally Posted by BullGator View Post
Starsan using tap water is good for a min of 2 weeks.
Not with any assurance, as "tap water" varies too widely. The only way to know for sure is to test it with a ph meter.

My current batch was mixed with distilled water back in July, with fresh gallons added over time. It still measures well below ph 3...

Cheers!
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