Lifestraw Peak Series Gravity Filter SystemProtects against 99. 999999% of bacteria (including E. coli, Salmonella), 99. 999% of parasites (including Giardia and Cryptosporidium), 99. 999% of microplastics, silt, sand, and cloudiness Enhanced microfilter performance: Our re engineered membrane and custom backwash accessory means better performance against sand and silt, maintaining great flow over the long haul Extreme durability: premium materials make it tougher and ultra leak proof so youll