Yes, it does. It has been shown that LifeStraw’s membrane ultrafilters can remove 99.999 percent (log 5) of viruses, 99.999999 percent (log 8) of bacteria (including E. coli), 99.999 percent (log 5) of parasites (including Giardia, Cryptosporidium, and others), and 99.999 percent (log 5) of microplastics.