Msr hyperflow microfilter water filter the hyperflow microfilter utilizes the latest hollow fiber technology and our most advanced engineering to make water treatment so small and so easy to use it will change the way you travel in the backcountry its ergonomic design diminutive size and tool free maintainability make it just as appropriate on day trips as it is on multi day excursions add a filtration rate of 3 liters per minute and youve got the most efficient microfilter ever created a