The Quickdraw filter is easy to attach to the mouth of a drinking bottle - you can drink directly through it, or set up two bottles on either end of the filter, allowing clean water to collect in the second bottle. During filtration, the filter element captures impurities that are easy to rinse off using the included rinse washer or simply by shaking. If you use the two-bottle strategy, you can either let gravity do the work (filtration rate up to 1.75 liters per minute) or squeeze the bottle with the water to be filtered (up to 3 liters per minute). Unlike other squeezable filters, the integrity of this filter can be checked with a simple test when needed (follow the instructions). - The filter removes 99.9999% of bacteria and 99.9% of protozoa, including giardia, Cryptosporidium, E. coli, salmonella, and cholera - Filter element lifespan: up to 1000 liters - The package includes: - Quickdraw filter - Dirty side cap - ConnectCap adapter with cap, attachable to "narrow mouth" bottle