Since I have quite a bit a beer in my pipeline I have been keg conditioning instead of force carbing. I figure I'm saving on C02 that way. When I bottle conditioned I used to mix the sugar in boiling water and then add it to my bottling bucket. But my last 4-5 batches I just dumped the sugar in the keg and then racked the beer. So far they have all turned out fine. Have I just been lucky? Or does sugar need to be sterilized before being added to a keg?