There are different brands- chlorhexidine is the generic name- so I can't promise you what's on every label, but you could google the info also. Off-hand, I don't know where I read it, but you can also search for best temperature to keep it at- I'd guess cooler would be better, so that may help extend the life also. It's the big breeders, farms & clinics that buy most of the gallons. Or should be.