Reusable Face Mask - Filter Refills (10 pack) PM 2.5
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Mask filters for reusable masks inserted into the filter pocket on the inside of the mask to provide an extra layer of protection and filter germs.
You should not wash the filter. They should be disposed of and replaced after 48-72 hours of continued use.
PM 2.5 filter means it filters particules over 2.5 microns (ie pollen and most bacteria/viruses).