Portable outdoor water filter with 0.01 µm (micron) hollow fiber membrane. Designed for hiking, camping and emergency use. Filters suspended particles, sand, rust and other visible contaminants from natural water sources. Compact and lightweight for travel SWISS QUALITY & DURABILITY- 20-YEAR GUARANTEE. This steel bomb-proof filter is trusted by military and emergency professionals around the world to deliver water free of bacteria and protozoa RELIABLE HIGH OUTPUT: Generates up to 1 liter of filtered drinking water per minute. Suitable for 1 to 4 people PORTABLE & VERSATILE DESIGN: The easy-to-use and compact 20 oz (550 g) design -- with an ergonomic pump handle -- makes this filter ideal for hiking, backpacking, group camping, and emergency preparedness EASY TO CLEAN IN THE FIELD: Simply rinse the prefilter to remove any particles and brush the ceramic element with the supplied cleaning pad until the original filter color returns. Filter up to 13,000 gallons (50,000L) before replacing the filter