Longevity of StarSan

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pwndabear

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I've lurked a bit but maybe stupidly missed it:

What is the shelf life of a spray bottle of starsan?
 

shanecb

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Quite awhile. Once is starts to look cloudy you might want to think about pitching it (it's from a pH change I believe). Though, it could look slightly cloudy as soon as you mix it depending on your water chemistry. Should be fine for a couple of months, though. The following thread is a pretty good look at Star San longvity: https://www.homebrewtalk.com/f11/star-san-cloudiness-lab-report-103337/ it deals with the cloudiness issue.
 

Airborneguy

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I save whole buckets of star san mix and re-use them for about 2-3 brews, including my kegging days in between. Never had a problem. I usually dump it once I start seeing stuff floating in it.
 

Munsoned

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As noted above, the cloudiness is just the mineral reaction with the water. The pH is what really matters.
 

joebagodonuts

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Some rep from the company that makes StarSan was on BrewStrong a while back. He said that it is in fact the PH that matters - but that cloudy StarSan is an indication that the PH is off.
 

gromitXT

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Get some low pH-range (2-5ish) test strips. They're cheap - a lot cheaper than more StarSan. As long as they're testing in the low-3 range, you can keep using it.

At the rate I'm going (4 batches plus bottling since i mixed it up last?), I'm thinking my 32-oz bottle of Starsan will last me many years...

-g
 

corncob

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I mix 3 gal at a time in a bucket, with distilled water from the grocery store, and measure with a syringe. It never gets cloudy or stops killing. I end up dumping the last galllon or so because it ends up with particles of "junk" floating in it--probably due to the drunken dishwasher waving his arms madly over the open bucket. I have kept it for 3 or so months.
 
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