PROTECTS AGAINST bacteria (including E.coli and Salmonella), parasites (including Giardia and Cryptosporidium), and microplastics. ULTRALIGHT + LONG-LASTING: only 1.7oz; membrane microfilter lasts up to 2,000 liters. HIGHLY VERSATILE: Screws on to standard water bottles. FAST FLOW RATE: 3L/min – fill up a 1L bottle in just 20 seconds.