SILVIA Straw Water Filter Camping Travel Micro-filtration System by Diercon Ideal for hiking, backpacking, camping, travel, and emergency preparedness. Double filter technology with antibacterial Carbon pre-filter and hollow fiber Nano Ultrafiltration Membrane, to give a more effective straw water filter than anything else available on the market. Compare with LifeStraw and other survival filters that have 0.2 microns pore size, The Infinitum has 20 times smaller pore size 0.01 micron to filter out much more contaminants especially smaller sized particulates like viruses and bacteria. Infinitum utilizes two stages of purification; 1) The NANO-TUBULES ULTRA FILTRATION MEMBRANE (0.01microns) and 2) antibacterial carbon filter cleans to 0.01 Microns, eliminating 99.9999% of colibacillus, legionella, heavy metal ions, chlorine, volatile organic compounds (VOC), organic, reduce cysts, particulates (class 1), lead, mercury, chlorine, insect contaminants, and more. Removes 99.9999% of waterborne bacteria, including salmonella, choler, and E. coli, and 99.9999% of waterborne protozoa, including Giardia & Cryptosporidium. Also reduces turbidity, filtering down to 0.01 microns. Certified by TV SD, FDA, and NSF testing standards in accordance with ISO-9001:2008, 21 CFR 180.22 to ensure maximum quality and safety.