The NanoFlow FlexGuard filter is designed to handle water in both an urban and outdoor environment. It filtrates and removes typical contaminants found in North America, Europe, and other developed non-tropical areas. The Vitaloop FlexGuard filter profile: * Microfilter with 99,9999% efficiency on Bacteria (Escherichia coli and Salmonella typhi). Protozoa 99.997% (Giardia lamblia and Cryptosporidium). Parasites (Roundworms and similar) * Activated Carbon Filter: Absorbs chemicals (Chlorine, Benzene, and other VOC) and Heavy metals (Lead and copper). Microplastic and forever chemicals (PFAS). Improves taste, color, and odor. All components of Vitaloop are BPA FREE. All materials in contact with mouth or water are Food Grade Materials. The NanoFlow™ filters are tested combined by independent labs and meet protocols established by NSF International/ANSI. The Membrane Microfilter pore size – 0.2 micron meets NSF P231 standards. Combined with the multistage filtration, all filters meet the NSF/ANSI 42 & 53 standards.