Reusable foam filter
Non-disposable or reusable filters are usually made of foam and can be reused. You should check and wash your reusable filter at least once a week with warm, soapy water. Make sure to rinse it well to remove all soap and lay it out to dry before putting it back into your CPAP machine. Reusable filters are also known as pollen filters because they are better at filtering out some larger particles in the room air, such as pollen, dirt and pet hair.
Foam filters are reusable and should be cleaned on a regular basis and replaced as needed due to wear and tear.