Amazon.com The MiniWorks EX microfilter is MSR's worldwide best-selling microfilter, delivering long-lasting, field-maintainable water filtration in demanding environments. Engineered for frequent and heavy use, it utilizes the company's workhorse Marathon EX carbon/ceramic element to ensure clean, reliable, and taste-free water. Thanks to its innovative AirSpring Accumulator, 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. Features: 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 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. Made in Seattle, USA Effective against protozoa, bacteria, particulates, and chemicals/toxins; not effective against viruses Made in Seattle, USA Specifications: Weight: 1 pound 2.75 by 7.5 inches Filter Media: Ceramic Plus Carbon Filter Pore Size: 0.2 microns Flow (L/min): 1 liter per minute Flow (strokes per liter): 85 Cartridge Life: ~2000 liters Field Cleanable Yes Field Maintainable Yes Mechanical advantage: Yes Water Bottle Adapter: Yes Cartridge Replacement Indicator: Yes Product Description The MSR MiniWorks EX Microfilter Water Filter provides proven, reliable water filtration for camping and hiking, backcountry adventures, global travel, survival situations, and emergencies. The replaceable Marathon EX ceramic element removes bacteria (such as E. coli. Shigella, salmonella, cholera), protozoa (such as giardia, cryptosporidium, amoebae), and particulate, and its carbon core eliminates unpleasant tastes and odors caused by organic compounds such as iodine, chlorine, and pesticides. Thanks to its innovative AirSpring Accumulator, the microfilter is capable of pumping one liter of water per minute, a flow rate that is easily maintained in the field, without any tools. The MSR MiniWorks EX Microfilter meets NSF protocol P231 for removal of bacteria (99.9999%) and protozoa (99.9%), throughout its replaceable filter life of 2,000 liters of water. Compatible with a wide variety of water containers such as Nalgene, Camelback, and MSR Dromedary Bags (sold separately); bottom screws on to threaded lids, or water can be pumped directly into a hydration reservoir drinking tube. Lightweight and compact, the pump measures 7.5 x 2.75 inches and weighs one pound. A storage bag is included. Manufacturer’s limited lifetime warranty. Made in the USA.