How many filters are included in the BUFF® Filter Tube? June 07, 2022 10:27 Updated Each BUFF® mask includes five replacement filters. Related articles Do the seams leave marks on your face when you wear the BUFF® mask? How long can I use a filter before replacing it with another one? Can I use the BUFF® Filter Tube without a filter? Will my ears hurt when I wear my BUFF® mask for a long time? How many sizes of BUFF® Filter Tube are available?