These removable metal columns for the Inogen One G4 play an important role in maintaining performance for users to receive their prescribed oxygen delivery. With regular use, the sieve beds can wear down, which is why Inogen recommends replacing the columns approximately every 12 months. Users can perform this maintenance at home without needing tools, as the device is designed for manual column replacement. The Inogen One G4 also provides alerts when it’s time for a replacement, ensuring optimal performance. Patient Replacement: These removable metal columns allow for at-home servicing of your Inogen One G4. Regular Maintenance: Inogen recommends replacing the columns approximately every 12 months. User Alerts: The Inogen One G4 device will notify you when it’s time to replace the columns, ensuring optimal performance. Tool-Free Operation: The column replacement process is designed to be straightforward, requiring no tools, making it accessible for all users.