Dan (Runningwolf) is correct! In the corkidor you want it open to sanitize the corks and with the lid closed its sealed good anyway although it will eventually still need replacing. i have to replace mine usually only do to using it as a sanitizer also. Ive had it in the bucket for about 6 months and it would still knock you off your feet if the lid was popped in my room though so be careful opening and try to do that outside! Citric acid makes the sanitizer (S02) come out of solution much easier and faster but whenadding his only do it to the amount you are going to use at the time cause adding it to all will greatly shorten its shelf life due to that!