The MiniWorks EX Water Filter is MSR's best-selling filter for a reason, it gives us fresh, clean water wherever our travels take us. The pump action AirSpring Accumulator allows us to filter up to one liter of water per minute, while the ceramic filter removes bacteria, protozoa (including crypto and giardia), and particulates for a reliable source of clean drinking water. The carbon core removes organic material so we can drop the hose into any source and come out with water that smells and tastes delectable. The compact filter is easy to clean without any tools, perfect for long trips into the backcountry, and it screws on to a standard Nalgene bottle or any MSR dromedary bag.