I’ve got sanitizer I made before Christmas, brewing tomorrow. Wondering if it’s still effective-is there a shelf life on clean sanitizer water?
Depending on what kind of sanatiser it is, many will keep thier sanitising properties indefinitely and through many uses.
Acid based sanitisers like StarSan are effective as long as thier pH is below 3.0. A simple pH test is used to check it.
Other sanitisers like iodine based sanitisers are intended as a single use and disposed of after 24 hours.