Browse:HomeHelpFAQsMaintenanceHow often should I change my filter? How do I disinfect my face mask between uses? How often should I wash my face mask? How often should I change my filter? We recommend you change your filters daily. Filters are an inexpensive additional layer of protection in today’s world. Filters are available for purchase here, as well as a variety of other sources online. We offer both PM2.5 and N95 filters.