Storage in the refrigerator or freezer
I left the bottle of concentrate overnight in the refrigerator, and there is no precipitate on the bottom. I even put it in the freezer, and nothing precipitated out of solution. It simply became thick, like cool honey. This tells me that the concentrate can be refrigerated or frozen for storage, taken out only when needed.
Chemical reactions slow down with decreasing temperature. Would that mean the concentrate would last much longer if stored cold?
If so, perhaps it would last a decade or more in the freezer, or a few years in the refrigerator.