Originally Posted by BlackGoat
I use starsan in a spray bottle and will generally use it for up to a week or more before dumping it. You can extend its age out more if you mix with distilled water, and there is a way to check its effectiveness with ph strips/meter but I don't bother with that. Moving over to using a spray bottle instead of a full 5g bucket full of sanitizer has been a really helpful modification to my processes, I just keep about a half gallon in a small container (other than my spray bottle) that I use for things like running the solution through my transfer lines and autosiphon.
This will work. Now that I'm moving on to larger batches and have outgrown the kitchen, a spray bottle will be the ticket in the garage brewing.
I'll brew two weekends in a row when possible, then dump the sani.