Ideal for outdoor recreation, hiking, camping, scouting, domestic and international travel, as a filter for survivor use and emergency preparedness;0.1 Micron Hollow Fiber membrane removes 99.999% of all bacteria, such as E.coli, salmonella, and cholera. It also removes 99.999% of all protozoan cysts, including Giardia, cryptosporidium and other protozoa.;Highly versatile water fitler attaches to standard plastic bottle with internal 28 mm threading, can be used inline on hydration (camelbak) packs, gravity or bucket system, or used as a straw to drink directly from your water source;Light weight and durable - Weighs only 2 oz. makes it ideal to use in any survival our outdoor recreation situation. Use this filter as a survivor, camper, hiker, or for emergency preparedness.;The Versa Flow can be cleaned by backflushing to increase longevity of the filter - Filter capacity 20,000 liters