Home Brew Forums > Home Brewing Beer > General Techniques > Diluted/mixed Starsan shelf life?
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Old 03-14-2014, 12:56 AM   #1
raptoid
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Default Diluted/mixed Starsan shelf life?

I planned on filling up a small tote or bucket with mixed Starsan. My question is; if I keep a lid on it and sealed up, how long is it good for? Example: I'm trying to nail down final OG and I may have to check samples every 12-24 hours in order to determine when it's ready for bottling. Could I just mix up the sanitizer and leave it in this covered bucket for those few days; and would it still be safe to use throughout that time?
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Old 03-14-2014, 02:19 AM   #2
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I keep my 5 gal StarSan mix in a big plastic bin from walmart with a lid. I honestly keep it for about 3-4 months each batch. I don't worry about it being cloudy. I simply check the pH here and there and make sure it's around 3.0

If a batch gets really dirty with particulates then yeah I'll dump it but besides that I'll just keep it for a while.


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Old 03-14-2014, 02:34 AM   #3
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I keep 1 gallon jugs filled with it for months as well, with no issues when re-using. Just keep the O2 and sunlight away from it, and you will increase the shelf life.

Also, you don't want to take a FG reading that frequent. Take one when you believe it is done, and then again when you are ready to bottle/keg. For me that is a reading at 2 and 3 weeks for most beers I brew. Cheers!
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Old 03-14-2014, 02:52 AM   #4
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According to some stuff I've read the shelf-life of mixed StarSan can vary a lot depending on your local water. If the water is very hard it will shorten the life of the mixed material a lot. The safest thing is to buy a gallon of distilled water and use it to mix your StarSan. Once mixed in distilled water it should last for a very long time.
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Old 03-14-2014, 12:58 PM   #5
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Quote:
Originally Posted by Puddlethumper View Post
According to some stuff I've read the shelf-life of mixed StarSan can vary a lot depending on your local water. If the water is very hard it will shorten the life of the mixed material a lot. The safest thing is to buy a gallon of distilled water and use it to mix your StarSan. Once mixed in distilled water it should last for a very long time.
+1

The shelf life of starsan diluted with non DI water is directly proportional to the level of calcium in your municipal water supply. Ca+ reacts with the acid group, and the insoluble particulate is the cloud that's left behind. If your batch is cloudy, but still below 3.0 pH, you've bound all of the free calcium in the water and should be good to keep on sanitizing.
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Old 03-15-2014, 01:47 AM   #6
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Quote:
Originally Posted by madhatt3r View Post
+1

The shelf life of starsan diluted with non DI water is directly proportional to the level of calcium in your municipal water supply. Ca+ reacts with the acid group, and the insoluble particulate is the cloud that's left behind. If your batch is cloudy, but still below 3.0 pH, you've bound all of the free calcium in the water and should be good to keep on sanitizing.
Good to know! I've got hard water so I'll prob get a bunch of bottled water from the store for now.
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Old 03-15-2014, 01:50 AM   #7
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Quote:
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Good to know! I've got hard water so I'll prob get a bunch of bottled water from the store for now.
Make sure you grab the distilled water and not the "spring water" or some other kind. Distilled water has almost all the minerals removed and won't make your StarSan go south on you prematurely.
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Old 03-19-2014, 12:24 PM   #8
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I also keep some of my starsan in a squirt bottle. Makes for quick use when doing things like taking FG readings.
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Old 03-22-2014, 05:40 PM   #9
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Good info! I was just wondering about this the other night. Seems like a waste to mix the sanitizer and water only to dump it later that day. Do you guys worry about leaving the solution in a non-food grade bucket? I have a spare home depot bucket and twist off lid that I can use, but it's not food grade.

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Old 03-23-2014, 01:12 PM   #10
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I bought a 1 gal jug of water and a 1 qt spray bottle. Mix in the jug, fill the sprayer, use whatever one is best for the situation. Carboy and vinator: jug, tubing exterior and bottling bucket interior: sprayer. Dump any salvaged liquid into the jug at the end of the brew day. Have yet to experience it clouding at all, and my waste factor always ensures I have a rotation going. Takes about 6 weeks to go through it all.
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