when bottling homebrew, you add a small amount of priming sugar to the brew before you bottle it... the yeast converts the sugar to alcohol and CO2, providing the carbonation for the beer... I have 1.25 gallon kegs, and they don't require co2... just a couple tablespoons of priming sugar... jest ask corin how it tastes...
microbrews and reg'lar pissbeers are pasteurized, which kills the yeast, and therefore CO2 must be injected...
to market a beer, it almost always has to be pasteurized... which complicates things... fargin' feds..
So they're doctored.
Hmph.
beggin' yer pardon bro, I don't recall that you served up any home brew whilst I was there.
'course maybe the Irish car bombs erased it from muh memory.