i am thinking more as a added layer of protection.
there was that post about the various things to use like dishtowels etc.
So if you take a surgical mask or a bandana etc and add a coffee filter would you get better protection..and then add a scarf around it
the idea is to keep the viral load down.
I don’t think my permanent coffee filter can be adapted…
But, seriously, I don’t think a coffee filter would allow enough air through. Might check that out.