
How Long Does Star San Last?
Star San is my sanitizer of choice. It’s food safe and no rinse. Required contact time is one minute. It has worked very well for me for quite some time and I’m convinced that it’s one of the most economical solutions available if you use the spray bottle method. See: Star San Tips, Tricks and Guidelines
How Long Does Star San Last?
With regards to mixed Star San Solution: The official answer is probably… you should mix a fresh batch each time you use it. To really test the effectiveness, you need to titrate the solution and test the PPM.
Practically speaking, many homebrewers use and re-use Star San. If you’re going to do that, the solution should be relatively clear and the mixture should have a pH of under 3.5. Previously the recommendation I received from Five Star Chemicals was that the solution should by crystal clear, however, for bottles of Star San not older than 1 year (check the manufacture date on the bottle) crystal clarity isn’t necessarily a requirement.