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The NDuR Survival Straw is made from BPA free plastic, making this eco-friendly filter ideal to take with you on your travels. This water filtration system by NDuR removes what most other filters cannot; eliminating up to 99.9% of Micro-Organisms such as Giardia and Cryptosporidium, up to 99.99% of all chemicals and heavy metals, as well as up to 99.9999% of viruses and bacteria including E-Coli found in water sources. The NDuR Portable Filtration Survival Straw is portable making it easy to take along with for instant access to safe drinking water anywhere in the world.