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The reviews keep coming and one thing is clear, the Platypus GravityWorks™ Water Filtration System 4.0 Liter is changing how people filter water. Delivering four liters of filtered water is 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. Easily stay hydrated no matter where you are with this easy to use system.