SP184 Sawyer Complete .1 micron 4L Water Treatment System. 

INCLUDES: 4 LITER DIRTY WATER DISPENSER, 4 LITER CLEAN STORAGE VESSEL WITH DISPENSING CAP, 0.1 MICRON ABSOLUTE HOLLOW FIBER MEMBRANE INLINE FILTER, FAUCET ADAPTER, DRINK TUBE, CLEANING & MAINTENANCE INSTRUCTIONS 

1 Million Gallons Sawyer's Guarantee: The Sawyer Company is confident in their 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. That is why they can GUARANTEE THE FILTER FOR LIFE as long as you follow the simple care and use instructions. 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 needed to clean a ceramic filter 20 times. 

NO REPLACEMENT FILTERS OR CARTRIDGES ARE NECESSARY. 

Sawyer Water Filters feature a 0.1 Micron Absolute Hollow Fiber Membrane using 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. • SAWYER WATER FILTER - Removal rates: (7 Log Bacteria 99.99999%, 6 Log Protozoa & Cysts 99.9999%)