Bag water filter maximizes the ease of water filtration for camping, hiking, traveling, survival and acts as military surplus. The carbon fiber filter’s filtering effect is 6-8 times of activated carbon and has outstanding performance in absorbing unpleasant taste, odor, chlorine and heavy metal. The UF hollow fiber membrane can remove 99.9% of viruses and bacteria. A must-have protects you and your family from waterborne diseases. Feel free to drink directly from the fresh water source. Filter cartridges are replaceable.