Really? So 19kg = 19L of beer? Dunno why but I assumed it wouldn't work exactly like that.
I've been thinking of getting some scales for use in the brewery, for example I could record the net weight of a keg and then measure my kegs to work out how much beer is left in them. For example I need to transfer one of my kegs into a 9L keg so that I can keg another full batch this weekend. Whatever beer is already close to half empty I'll be drinking tonight in an attemp to get it down to 9L (just my civic duty you know). So it'd be awesome to weigh the kegs and know that it has say 10.5 litres meaning I only need to drink 1.5 litres to get it down to the right level.
Pushing StarSan with CO2 is not good as I recall. Causes some kind of reaction and it stinks. Possibly not goot to breath either.
+1 I've been doing it for over a year (since switching from iodophor to starsan) and haven't noticed any unexpected smells in my beer nor my stored empty kegs. I don't push as much through the diptube as argon; just enough to get contact, but I do purge and pressurise the kegs while there's still residual starsan there. Anyway, it'll be good to know for sure, so I've just sent off an email to Five Star Chemicals - let's see what they say...
There is no reaction that occurs between Star San and Carbon dioxide. If someone experienced an odor, then something else was present.
Your procedure of purging the kegs with CO2 is fine.
Jon Herskovits
Five Star Chemicals