Although still fermenting, I plan to bulk age this wine (MM All Juice Shiraz) in the carboy for 3 months before bottling. I know that sulphite solutions eventually lose theirstrength when exposed to air, so when bulk aging for 3 months is it better to pull the airlock and replace the sulphite at some interval (every month, after 6 weeks, ...) or just leave it alone? I don't want all the sulphite to dissipate and leave the wine unprotected, but I also don't want to unecessarily expose it to air. I've also read that some folks use vodka - would that have the same issue?What do you experts do?