The MiniWorks EX microfilter is the worldwide best-selling microfilter, delivering long-lasting, field-maintainable water filtration in demanding environments. Engineered for frequent and heavy use, it utilizes MSR&';s workhorse Marathon(TM) EX carbon/ceramic element to ensure clean, reliable and taste-free water. Thanks to its innovative AirSpring Accumulator(TM), it&';s capable of pumping one liter per minute and the flow rate can be renewed easily and repeatedly in the field-no tools required. It&';s lightweight and compact and, most importantly, been proven reliable by thousands of adventurers just like you. Testing: Meets NSF protocol P231 for removal of bacteria (99.9999%) and protozoa (99.9%) from beginning to end of filter life in "worst-case" water. Reliable: Durable carbon/ceramic element ensures safe, taste-free water-even with frequent, heavy use. Field-maintainable: Can be cleaned repeatedly for full filter recovery with no tools required. Fast Flow: AirSpring Accumulator(TM) increases filtration speed; up to 1-liter per minute. Better-tasting Water: Carbon core removes unpleasant tastes and odors caused by organic compounds, such as iodine, chlorine, and pesticides. Tech Specs Weight (Standard): 1 lb Weight (Metric): 0.46 kg Width (Standard): 2.75 in Width (Metric): 7 cm Length (Standard): 7.5 in Length (Metric): 19 cm Effective against bacteria: Yes Effective against chemicals/toxins: Yes Effective against particulate: Yes Effective against protozoa: Yes Effective against viruses: No Filter media: Ceramic Plus Carbon Filter pore size (microns): 0.2 Flow (L/min): 1 liters per min Flow (strokes per liter): 85 Cartridge life: ~2000 liters Field cleanable: Yes Field maintainable: Yes Water Bottle Adapter: Yes Cartridge replacement indicator: Yes Country of Origin: Made in the U.S.A. of U.S. and Imported Materials Mechanical advantage: Yes Video: