jayjay
The BE-Team Fighting For Betta Extermination
They use CO2, or carbon from ferts, not really the same thing I don't think 



If you are referring to the carbon, it's to remove chemicals from the water, like after using meds or something. It's only good for a month anyways, so you should change it or take it out after that period of time.. or it may release "stuff" back into the water.