The NDūR Survival Straw contains an Advanced Filter that that uses the advanced technology of Seychelle. This Survival Straw is made from BPA free plastic. NDūR’s Portable Filtration Devices are the most laboratory and field-tested of their kind in the world using EPA protocols and tested to NSF/ ANSI Standards 42 and 53 by Broward Testing Laboratory. NDūR’s Advanced Filtered products remove what most other filters cannot; eliminating up to 99.9% of Micro-Organisms such as Giardia and Cryptosporidium, up to 99.99% of chemicals and heavy metals, as well as up to 99.9999% of viruses and bacteria including E-Coli found in water sources. With the NDūR Survival Straw you have instant access to safe drinking water anywhere in the world. It eliminates the need for bottled water which saves money, and reduces your plastic footprint by keeping hundreds of disposable water bottles out of our landfills and oceans.