I mixed 5 gal of starsan about a month ago and stored it in a spare glass carboy and have kept it covered. I went to the pool supply store to buy pH test strips to see if its still below the 3 pH suggested elsewhere. The guy said I’d be fine with the ones I bought and I got them home and their range is like 6.2-7.5…even after asking the owner if they would detect down to 3pH.
Anyway, back on topic. I was wondering if you guys think this is still usable for sanitizing. I plan on bottling this weekend and want to avoid mixing up a whole entire batch cause I’m kinda frugal. Should I risk it or just be safe and mix up some new stuff?