Keep your CanKeg up and running with a 5 pack of 16g CO2 cartridges. Just like the old cartridges you used with your Atari 2600, except now you're an adult and you use cartridges for drinking beer.
All of our cartridges are guaranteed 100% food-grade CO2.
You should be able to dispense about 6L of beer with one 16g cartridge. The main reason you might not achieve this is if you leave the regulator pressure set too high when not in use.