10 Filters are recommended per mask.. Keep in mind all
cloth mask are made to be washed after several wear and filters are important to change.
Five Layer Protection: First layer of spunbond cloth filters micron-level dust. Second layer filters industrial pollutants, automobile exhaust, second-hand smoke, and pollen allergens. Third layer of activated carbon cloth filters micron-level dust. Fourth layer offers filter density for smaller material. Fifth layer of spunbond cloth filters out all kinds of harmful substances.