Mastrad A02155 Food Grade CO2 Cartridge for Pure Fizz, 8gm, 20-Pack Set of 20 Food-Grade CO2 Chargers by Mastrad Each cartridge is filled with 8 grams of pure CO2 For use with the Mastrad Purefizz Soda Maker; carbonate beverages right at home Purefizz carbonates more than soda; make sparkling juices; add bubbles to alcohol and more For one-time use with Purefizz bottle