Review on Protection Polypropylene Nanofiber Efficiency Breathable by Roy Niemeyer

Make your own 5-ply face masks with this filter. A 2-ply cotton mask plus this is adequate protection and economical too, cut the filter to fit your mask pouch, adjust the embossed side towards your nose, discard the filter after use and wash the mask. I think that if used daily by 2 adults and a child this reel should last 3-6 months with constant use. Affordable protection - highly recommend. And there are NO problems breathing through the filter. If you can no longer breathe through the filter, you may need to see a doctor. But there are no problems here.