The LifeStraw Personal Water Filter uses a microfiltration membrane to remove 99.999999% of waterborne bacteria (including E. coli and Salmonella), 99.999% of parasites (including Giardia and Cryptosporidium) and microplastics down to 1 micron. The filter is rated for 4,000 liters (1,000 gallons) with proper use and maintenance, and the materials are BPA free. Claims are verified by laboratories using EPA, NSF and ASTM test protocols.