How long does star san keep?

[Schwabizzle]

I like to keep a spray bottle of star san on hand for those necessary sanitizing situations between brews. How long does star san keep,or should I be mixing up a new batch each time I need it?

 

[beerlover77]

I use it for a month or two or three. It is stored in a gallon jug with a lid and spray bottle

 

[flars]

The solution will keep forever as long as the pH is not over 3.0. Star San is an acid base sanitizer. Age won't affect it but dilution will. It is still an effective sanitizer if minerals in the water turn it cloudy.