ADVANCED NANOMESH TECHNOLOGY: Removes up to 99.9% of contaminants commonly found in tap water. Targets 200+ contaminants, including bacteria, heavy metals, and mercury. Enjoy fresher-tasting water while protecting your health and well-being. TESTED TO 3 NSF STANDARDS: Tested to 3 NSF Standards - NSF 42, NSF 53, NSF 401 - by IAPMO R&T Laboratories. With 4Patriots water filters, you can feel confident about the water you drink. GRAVITY-POWERED CONVENIENCE: Hybrid, 2-step design that filters your water without electricity, heat or chemicals.Perfect for emergencies, off-grid living, or everyday use. EASY TO CHANGE: Simple, tool-free filter replacement makes maintenance quick and hassle-free. Spend less time replacing filters and more time enjoying clean water. Use up to 4 filters for cleaner water at a faster pace. LONG-LASTING FILTRATION POWER: Each filter provides up to 200 gallons of purified water. Some contaminants get reduced at the claimed rates for even longer — up to 800 gallons. Save money with fewer replacements and more peace of mind. MADE IN THE U.S.A.: Proudly designed and manufactured in the USA for superior quality and durability. Feel confident in a product that meets high standards and supports American jobs. Your Patriot Pure NanomeshTM Water Filters use advanced technology for superior water purification. Used by NASA and the military, this "Rocket Science" targets 200+ dangerous contaminants. This helps fight things like bacteria, heavy metals, and mercury. You'll enjoy cleaner, fresher-tasting water no matter what. Each filter is tested up to 200 gallons by an ANSI-certified independent laboratory using NSF standards (up to 800 gallons for some contaminants).. With the ability to use up to 4 filters at once, you can maximize your water flow rate for any situation. Plus, filters are a breeze to replace – no tools, heat, or electricity required! Extra filters on hand means you’re always ready. When it’s time for a change, you'll still have safe, clean water. Made in the USA, and designed to deliver top-notch performance every time.