LifeStraw Go features two-stage filtration to make microbiologically contaminated water safe to drink. Stage one is a hollow fiber membrane that removes 99.9999 percent of bacteria (E. coli and salmonella), 99.9 percent of protozoa (Giardia, Cryptosporidium, etc.), and reduces turbidity by filtering particulate matter to 0.2 microns. Stage two is an activated carbon capsule that reduces chlorine, organic chemical matter (like herbicides and pesticides), and bad taste. The hollow fiber membrane filters up to 264 gallons throughout its life; the carbon capsule filters 26 gallons. Replacements are available for both. LifeStraw Go is engineered for a broad range of activities, from hiking, running and traveling to everyday use at work, home or the gym. It weighs under eight ounces and holds 22 ounces of filtered water that meets stringent US EPA standards. It features a flip top bite valve and carabiner, is BPA and chemical free, and raw materials meet US FDA regulations.