title_body: Do kegs go bad faster once they are tapped?
upvoted_answer: Soo... There are two main ways to push beer out of a keg. Carbon Dioxide and regular air. Most bars use CO2 (and Nitrogen in some cases) to push the beer out. Your regular backyard kegger uses regular air which is full of oxygen. A keg will not go bad if you take it offline as long as it was being filled with CO2 at the right pressure. (Or let's say it won't go bad for many days or weeks if properly filled with CO2). Your backyard keg with the hand pump, the beer will go stale within a day or two.