I see a lot of guys doing this to spray things down before bottling or transferring from primary to secondary. My question is how long does it stay active and does it hurt anything to leave it in there for extended amount of time?
I usually keep it in there for 2-3 brews, which usually ends up being a month or two. At which point I use a dropper or small syringe to mix another liter or so of starsan solution.
It's good as long as it's ph stays below 3 I believe. Hard to tell when that is without a ph meter though. It'll stay good longer than I use I'm sure, but it's cheap and goes a long way. It'll stay even longer if you use distilled water.
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