I tend to stick to iodophor for my primary fermentations (I've had really old bottes, 5+ years), but don't think that stuff goes bad as easily. Its also a bit more powerful at killing than acid based sanitizers, plus I don't have to worry about it corroding / leaching plastic parts on my fermzilla.
Saniclean (low foaming starsan) I use for keg purging, but risk of infection at that stage is much lower. I do try to replace those bottles every two years or so. Starsan I just keep in a spray bottle for odds and ends, probably bottles as old as 3 years. Never had an infection, but think its because I use iodophor.
Saniclean (low foaming starsan) I use for keg purging, but risk of infection at that stage is much lower. I do try to replace those bottles every two years or so. Starsan I just keep in a spray bottle for odds and ends, probably bottles as old as 3 years. Never had an infection, but think its because I use iodophor.