MSR MiniWorks EX Microfilter Water Filter -Designed for constent and heavy useage the MSR Miniworks EX water filter is built to last. It's ceramic filter has been infused with carbon to not only elimanate harmful bacteria but also improve taste. The Miniworks' AirSpring Accumulator improves water flow to one liter per minute. As pumping gets harder with use this flow rate can be restored by removing and cleaning off the filter carterage, easy even in the field. Miniworks is 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 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. Filter Media: Ceramic Plus Carbon Filter pore size: 0.2 microns Flow: 1 liter per min Flow (strokes per liter): 85 Cartridge life: 2000 liters Field cleanable: Yes Field maintainable: Yes Water Bottle A BPA Free