Platypus Gravityworks 4 Liter Water Filter - Delivering four liters of filtered water in just 2.5 minutes with no pumping, there's simply no easier or faster way to get safe water away from home. Ideal for bigger groups, the system's eight-liter capacity eliminates both the worry and hassle of keeping plenty of water around for anything you need.Filters 4 liters in 2.5 minutes.Weighs just 10.75 oz. (305 g)8L capacity lets you easily transport and store water for groups.Backflushes in four seconds, maintaining optimal performance with no additional parts or tools required.Platy(TM) zip opening collects water easily-even in challenging situations.Clean storage reservoir with shutoff clamp makes dispensing water a breeze.Create a custom system to meet your personal needs using our wide range of accessories.Effective: Meets all EPA & NSF guidelines for the removal of Bacteria and Protozoa, including Giardia, Cryptosporidium, E. coli, Salmonella and Cholera. Weight: 10.75 ozWidth: 3 inLength: 9.5 inFilter Media: Hollow FiberFilter Pore Size: 0.2 micronsFlow Rate: 1.75 liters per minuteFilter Cartridge Life: 1500 liters