NDūR’s Portable Filtration Devices are the most sophisticated portable water purification devices in the world. Each containing an Advanced Filter featuring Seychelle Technology. Not only does it remove up to 99.99% of chemicals and other contaminants like E-Coli, Giardia, and Cryptosporidium, it also protects against viruses and bacteria up to 99.9999% in water that other filters cannot remove.Seen as one of the safest, most convenient, low-cost alternatives to boiling, purification drops, or bottled water, and is suitable for travel throughout the world. Simply fill your container from any tap, stream, river or lake, even in third world countries, and enjoy safe, clean drinking water straight away. Key Factors for the 28 oz Flip Top Bottle: Made from BPA-free plastic Filter Life: up to 100 Gallons or more,depending upon the quality of the source Unique design prevents leaks Ideal for those traveling abroad Removes up to 99.9999% of: Virus Bacteria Removes up to 99.99% of: Chlorine Lead Mercury Cadium Aluminum Copper Micro-organisms, such as - E-Coli - Giardia - Cryptosporidium