MSR Mini Works EX Microfilter Water Filter The Mini Works EX microfilter is the worldwide best-selling microfilter, delivering long-lasting, field-maintainable water filtration in demanding environments. Engineered for frequent & heavy use, it utilizes our workhorse Marathon TM EX carbon/ceramic element to ensure clean, reliable & taste-free water. Thanks to its innovative Air Spring Accumulator TM, it's capable of pumping one liter per minute & the flow rate can be renewed easily & repeatedly in the field-no tools required. It's lightweight & compact &, most importantly, been proven reliable by thousands of adventurers just like you. * 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: Air Spring Accumulator TM increases filtration speed up to 1-liter per minute. * Better-tasting Water: Carbon core removes unpleasant tastes & odors caused by organic compounds, such as iodine, chlorine, & pesticides. Effective against protozoa Yes Effective against bacteria Yes Effective against viruses No Effective against particulate Yes Effective against chemicals/toxins Yes Weight 1 lb / 456 g Width 2.75 in / 7 cm Length 7.5 in / 19 cm Filter media Ceramic Plus Carbon Filter pore size 0.2 microns Flow (L/min) 1 liters per min Flow (strokes per liter) 85 Cartridge life ~2000 liters Field cleanable Yes Field maintainable Yes Country of Origin Made in Seattle, USA Mechanical advantage Yes Water Bottle Adapter Yes Cartridge replacement indicator Yes