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-   -   How long is Star Sans viable? (http://www.homebrewtalk.com/f39/how-long-star-sans-viable-276684/)

naemlss 10-25-2011 07:44 PM

How long is Star Sans viable?
 
I have been using star sans in a blow of tube setup. How often should I change the star sans solution that the blow of tubes enter? As well how long is star sans undiluted viable or should I be buying new every time I brew?

pericles 10-25-2011 07:52 PM

The starsan in the blow-off tube (bucket/bowl/whatever) should last for the duration of your fermentation, unless you're brewing something really outrageous like a 2-year lambic.

The starsan in the bottle, undiluted, should stay good for at least a couple of years.

mattd2 10-25-2011 07:58 PM

Quote:

Originally Posted by pericles (Post 3422725)
...The starsan in the bottle, undiluted, should stay good for at least a couple of years.

I would say it will not go bad. It's basically just phosphoric acid and some other stuff, why would it go bad?

pericles 10-25-2011 08:03 PM

Quote:

It's basically just phosphoric acid and some other stuff, why would it go bad?
Meh. You're probably right. There's an interview with the guy who makes the stuff on the BN that I listened too, and I got the (loose) impression that some of the chemicals in there were volatiles. Given that the plastic container isn't 100% oxygen impermeable (nothing is, not even glass. Remember your QM!) I figure the stuff inside will eventually degrade. Maybe not for a thousand years, but I figure, for the eight bucks, why not buy a new bottle after two?

kmonty 10-25-2011 08:04 PM

A brewing buddy of mine talked with someone at Star San. They said it lasts a week or two. The test is to shake it up - if it's cloudy, toss.
Now I am well aware that the rep wants to sell more Star San and replacing every couple weeks is a good way to do it.

I just make up a spray bottle for brew day, then another for bottling day.

android 10-25-2011 08:09 PM

mix it with distilled water and it will last a LONG time. never clouds up that way.

gsector 10-25-2011 08:18 PM

If you mix distilled water and star san in a 5 gallon bucket and keep a lid on it, and you don't dunk dirty stuff in the solution, it pretty much lasts forever. If its cloudy, its pretty safe to say its no bueno. The harder your water is, the less long it tends to last.

You can measure the pH too.

unionrdr 10-25-2011 08:18 PM

A little cloudy is still viable. Craigtube has a video posted where he shows a test like this. I can get a couple months out of a 1 gallon batch easy. maybe more,but I do filter it now & then,as I also do with PBW.

lightmedium 12-12-2011 08:58 PM

My Star San is cloudy as soon as I mix it, does this mean it isn't working as well as it should? If it starts out cloudy, how do I know how long I can keep it? I guess I need to get lids for my HomeDepot buckets and start using distilled water.

509inc 12-12-2011 09:08 PM

Brew Strong has a podcast with 5star where he stated as long as the ph is 3.2 or lower.

That said I mix 5 gallons at a time and keep it for months in a bucket with lid for months.


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