Edited sentence: By contrast to Real Ale, this is beer which is filtered and pasteurised to remove every last vestige of yeast and life, and is thus dead beer.So it is with beer.The brewers then seem to think it is OK to attempt to revive it by injecting excessive doses of CO2 (keg beer and lager), or mixed gases ("smoothflow").When I'm dead, no matter how much air they inject into me, it isn't going to stop me starting to smell and taste a bit off