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Change for the worse in Star San longevity? At least in my new bottle...

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mugwort:
I just unsealed a new 32oz bottle of Star San to replace the 32oz bottle I've used for about a year and a half. Something I noticed immediately is that solutions made from this bottle of Star San cloud over much more rapidly than those made from the previous.

From my previous bottle I was getting shelf life of about a week with a covered, mixed-up batch of SS (1oz to 5 gal water). But solutions made from this latest bottle cloud over within a day (even when in a covered container or spray bottle).

Since Star San's pH (and therefore microbe-killing power) can be roughly judged by the clarity of the solution, I'm forced to consider changing my sanitizer habits to include discarding fresh but hazy solution and mixing batches more frequently.

BTW, the labels look legit and product was purchased from a reputable retailer.

Anybody else out there seeing a change in recent batches of Star San?  I'm pretty sure that my water didn't change that much over the course of a few weeks.

morticaixavier:
I have heard recently, I think from Denny, that the cloudiness = higher pH is not really all that accurate. If you have the ability to test pH that is your best bet for figuring out if the star san is still good.

I mix mine with tap water so it clouds over almost immediatly but still seems to work (fingers crossed, no infections yet)

alcaponejunior:

--- Quote from: morticaixavier on January 03, 2013, 03:31:09 PM ---I have heard recently, I think from Denny, that the cloudiness = higher pH is not really all that accurate. If you have the ability to test pH that is your best bet for figuring out if the star san is still good.

I mix mine with tap water so it clouds over almost immediatly but still seems to work (fingers crossed, no infections yet)

--- End quote ---
I also mix with tap water, instant cloudiness.  No issues so far.  I haven't tested the pH but perhaps I will pick up some strips and check it out.

hubie:
This is very interesting because I am in exactly the same boat as you.  I suddenly noticed that my buckets cloud over very quickly, like within an hour or two, whereas before it would go for several days before clouding up.  I also switched to a new 32 oz bottle.  I didn't think to associate it with the StarSan.  I had assumed that the mineral content of my water had changed going from winter into spring, or whatever the seasons were at the time.

mudman:
I have a friend who checks the Ph on his and he says that storing it covered, it lasts for month.

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