The LifeStraw Mission + Purifier Protects against viruses, bacteria, parasites, dirt, sand, and cloudiness. The LifeStraw Mission + Purifier is Independently lab tested, durable and BPA Free. Every fill avoids single use plastic bottled water!

This is a 12 liter system.

The difference between membrane microfilters and membrane ultrafilters is the pore size. LifeStraw's membrane ultrafilter pores are 0.02 micron —10 times smaller than the pores of the membrane microfilter. Both technologies work via the same mechanism, but ultrafilters also block viruses due to the smaller pore size. When dirty water enters the ultrafilter, the microscopic pores block viruses, bacteria, parasites, microplastics, dirt, and other turbidity forms.

Clean water passes through the pores in the membranes making the water microbiologically safe to drink. Because of the smaller pore size, ultrafilters often have a slower flow rate or require more pressure to purify water than microfilters. 

LifeStraw Membrane Ultrafilters are capable of removing:
99.999% (log 5) of viruses (including Rotavirus)
99.999999% (log 8) of bacteria (including E. coli and Salmonella)
99.999% (log 5) of parasites (Giardia and Cryptosporidium)
99.999% (log 5) of microplastics.

LifeStraw classifies their products that use membrane ultrafiltration technology as purifiers because they remove viruses too.