As I wrote: Bacteriophage MS2 - 23nm : Surgical mask 89.52% filtering Tea towel one layer 72.46% filtering -> Thus still ~70% filtering of 23nm particles fo

As I wrote: Bacteriophage MS2 - 23nm : Surgical mask 89.52% filtering Tea towel one layer 72.46% filtering -> Thus still ~70% filtering of 23nm particles for the one layered towel. They didn't put the number for a two layered towel in there, I wonder if it did beat the surgical mask.