This replacement Katadyn BeFree filter works with all BeFree filter systems, including bottles and gravity bags, to give you the freedom to drink anytime, anywhere by filtering water to EPA standards. Filters up to 2 liters of water per minute Easy to clean: simply shake or swish to remove debris 0.1 micron microfilter is tested to protect against harmful organisms, removing protozoa (99.99%) and bacteria (99.9999%) to EPA standards Tested to 1,000 liters; individual results will depend on water quality