Please do not purchase a "Filter Cartridge" if you don't have the outer casing for the Nano XP filter. The Nano XP Filter is our most advanced design yet, featuring double-layer nano pleated media for twice the surface area and a 30% faster flow rate. Independently tested to NSF/ANSI Standards 42, 53, 401, P231, and P473, it removes over 70+ contaminants including PFAS, lead, pharmaceuticals, bacteria, viruses, and microplastics. This filter is NSF CERTIFIED to standard 42 and produces up to 100 gallons of clean water (about 3–4 months), making it ideal for everyday use, well water, camping, or emergency situations. With its replaceable inner cartridge, the Nano XP cuts plastic waste by 75% while preventing over 1,000 single-use bottles from reaching landfills. Proudly assembled in the USA using premium filtration media, it combines powerful contaminant reduction with a sustainable design—delivering clean, safe water and a positive environmental impact.