I mixed a 7 gallon batch of Starsan to do Passivation to my fermentor, my question is can I transfer it to my kegs and store it there for an extended period of time? weeks, months?
I always buy distilled water and make 2 gallons of starsan, and toss it every 4 months or so JUST to be safe.
Use distilled water and it keeps a long time. Never kept any I mixed with tap water, but that doesn't happen often. It gets cloudy and I don't like that
Star san is pretty cheap for how much you use. When in doubt, start fresh.