Did you know inside your Oxlife Liberty 2 there's an inlet filter that needs to be replaced every so often? If you didn't, that's okay—with everything you have to worry about it's easy to overlook the fact this inlet filter actually exists. Now there's no clear cut time period you need to replace the Oxlife Liberty 2 inlet filter, as that's all dependent on your personal frequency, overall duration of use, and the environment your specific Oxlife Liberty 2 POC experiences. Oxlife has mentioned that the easiest way to tell it's time to change this inlet filter is when it's visibly soiled. Regular inspection and timely replacement of the inlet filter helps maintain optimal performance of your portable oxygen concentrator by ensuring clean air intake and protecting internal components from debris.