Hey Folks - I've just brewed my first ever batch of beer, which is pretty good...if a bit strong! I want to add some CO2 to my pressurised keg- I've got a CO2 injection system and some small CO2 capsules. It says on the box to add 1 capsule per litre but I wanted to check if this was accurate for beer? I've got about 20 litres left - which would be 20 capsules??