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Sawyer® 4 Liter Water Treatment System: Fully Sealable and Dispensing 4L Nylon Dirty Water Vessel and Biological Inline Filter. Filter removes sediment, protozoa, cysts, and bacteria such as E. coli, Giardia, and Cryptosporidium. 1 Million Gallons Guaranteed We didn't actually run a million gallons through the filter, because that's a lot of water... but we could have! We are confident in our million gallon claim because you can continually clean the filter by backwashing it with clean water. So there really is no end to its useful life. Follow the helpful hints included in the directions for use. Backwashing is not required often unless you are filtering very turbid water. Backwashing only takes a few seconds. If you are accustomed to a ceramic filter, the leaning ratio is approximately 20:1. In other words, by the time you first need to clean your hollow-fiber filter you would have neeeded to clean a ceramic filter 20 times. NO REPLACEMENT FILTERS OR CARTRIDGES ARE NECESSARY. We trust you will thoroughly enjoy the ease and extra protection this proven next-generation technology offers you. The Sawyer® Water Filters feature a 0.1 Micron Absolute Hollow Fiber Membrane, which uses medical technology developed from kidney dialysis. When the water is drawn through the filter, it flows through the side walls of the Hollow Fiber tubes. Sediment, bacteria, protozoa, cysts, and other contaminants are filtered out exceeding all applicable EPA recommendations. NO CHEMICALS, NO WAITING, NO PUMPING, NO WORRIES! • Biological Filtration: Sawyer® Water Filters offer the highest level of biological filtration available in the portable water filters category for removal of bacteria, E. coli, Giardia, and Cryptosporidium. Shipping Weight 3lbs. Ships Priority Mail or UPS Ground. |