Originally Posted by Guidry
For those who keep it for extended periods of time for reuse, what kind of container do you store it in? Does it need to be air tight?
My current batch was "brewed" in October, freshened in January and again in April with a gallon of mix each time. I keep it in a 5 gallon glass carboy with a solid bung. I don't know that it benefits from being sealed up per se, but the bung keeps dust 'n' crap from getting in, and keeps the mix from sloshing out when I lug the carboy upstairs on brew days.
Tested with a Hanna 98128 whenever I use it, it remains below pH 3.