Filter, nanofilter, nano, textile, nanofiber, production, Elmarco, Drylock, company FFP2

Filter, nanofilter, nano, textile, nanofiber, production, Elmarco, Drylock, company FFP2

Companies Elmarco and Drylock (pictured) produce nano filters with FFP2 in Hradek nad Nisou near Liberec, Czech Republic, March 25, 2020. (CTK Photo/Radek Petrasek)

Filter, nanofilter, nano, textile, nanofiber, production, Elmarco, Drylock, company FFP2

Filter, nanofilter, nano, textile, nanofiber, production, Elmarco, Drylock, company FFP2

Companies Elmarco and Drylock produce nano filters with FFP2 in Liberec, Czech Republic, March 25, 2020. (CTK Photo/Radek Petrasek)

Filter, nanofilter, nano, textile, nanofiber, production, Elmarco, Drylock, company FFP2

Filter, nanofilter, nano, textile, nanofiber, production, Elmarco, Drylock, company FFP2

Companies Elmarco and Drylock (pictured) produce nano filters with FFP2 in Hradek nad Nisou near Liberec, Czech Republic, March 25, 2020. (CTK Photo/Radek Petrasek)

Filter, nanofilter, nano, textile, nanofiber, production, Elmarco, Drylock, company FFP2

Filter, nanofilter, nano, textile, nanofiber, production, Elmarco, Drylock, company FFP2

Companies Elmarco and Drylock (pictured) produce nano filters with FFP2 in Hradek nad Nisou near Liberec, Czech Republic, March 25, 2020. (CTK Photo/Radek Petrasek)

Filter, nanofilter, nano, textile, nanofiber, production, Elmarco, Drylock, company FFP2

Filter, nanofilter, nano, textile, nanofiber, production, Elmarco, Drylock, company FFP2

Companies Elmarco and Drylock (pictured) produce nano filters with FFP2 in Hradek nad Nisou near Liberec, Czech Republic, March 25, 2020. (CTK Photo/Radek Petrasek)

Filter, nanofilter, nano, textile, nanofiber, production, Elmarco, Drylock, company FFP2

Filter, nanofilter, nano, textile, nanofiber, production, Elmarco, Drylock, company FFP2

Companies Elmarco and Drylock (pictured) produce nano filters with FFP2 in Hradek nad Nisou near Liberec, Czech Republic, March 25, 2020. (CTK Photo/Radek Petrasek)

Filter, nanofilter, nano, textile, nanofiber, production, Elmarco, Drylock, company FFP2

Filter, nanofilter, nano, textile, nanofiber, production, Elmarco, Drylock, company FFP2

Companies Elmarco and Drylock (pictured) produce nano filters with FFP2 in Hradek nad Nisou near Liberec, Czech Republic, March 25, 2020. (CTK Photo/Radek Petrasek)

Filter, nanofilter, nano, textile, nanofiber, production, Elmarco, Drylock, company FFP2

Filter, nanofilter, nano, textile, nanofiber, production, Elmarco, Drylock, company FFP2

Companies Elmarco (pictured) and Drylock produce nano filters with FFP2 in Liberec, Czech Republic, March 25, 2020. (CTK Photo/Radek Petrasek)

Filter, nanofilter, nano, textile, nanofiber, production, Elmarco, Drylock, company FFP2

Filter, nanofilter, nano, textile, nanofiber, production, Elmarco, Drylock, company FFP2

Companies Elmarco (pictured) and Drylock produce nano filters with FFP2 in Liberec, Czech Republic, March 25, 2020. (CTK Photo/Radek Petrasek)