The removable columns for your Inogen One G4 machine contain sieve filters that remove inert gases from the room air around you and help concentrate it into medical-grade oxygen. As a general rule of thumb, it is recommended that the columns be replaced every 12 to 18 months to ensure that your machine is producing the correct concentration of oxygen.

*Please note: It is possible that your Inogen One G4 machine may require you to replace its columns earlier than you would normally expect due to the varying operating conditions under which the Inogen One G4 can function. If you see an “O2 Service Soon” error appear on your concentrator’s display screen, it is letting you know that its columns need to be replaced.