What do you think the shelf life on yours is if refrigerated? He says a week and I have not noticed any issues with it. I was going through a half gallon in about 10 days dosing it daily. I dont have a microscope so no idea if it was dead at that point. Didnt smell bad or anything.PNS bacteria most likely, I want to try that also. And I am also using carboys.

are you just starting it? Trying to green the water?