The HyperFlow utilizes the latest Hollow Fiber Technology in a package so small and so easy to use it will change the way you travel in the backcountry. MSR says:Restore flow rates in your HyperFlow Microfilter with fresh, new Hollow Fiber media. Filters up to 1000 liters. Results will vary depending on conditions.Our VerdictThe HyperFlow utilizes the latest Hollow Fiber Technology in a package 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.- Reviewed by Ultralight Outdoor GearFeaturesRefresh flow ratesWARRANTY|This item comes with a product lifetime warranty. For more information see the MSR website.SpecificationsWeight: 70gLength: 12.5 cm / 4.9 inDiameter: 3 cm / 1.2 inFilter media: Hollow fiberCaartridge life: 1000 litersCatridge housing: ABC / PC blendMaterials: Hollow fiberEffective against: Protozoa (Cryptosporidium and Giardia), Viruses, Parasites, Particulates.Not effective against: Viruses, Chemicals / Toxins – as with all filters chemical treatment is also required.Help & advice:The Ultimate Guide to Water Treatment and PurificationTime-Saver Guide to Water Purification

The HyperFlow utilizes the latest Hollow Fiber Technology in a package so small and so easy to use it will change the way you travel in the backcountry. MSR says:Restore flow rates in your HyperFlow Microfilter with fr