The Sawyer Point Zero Two Purifiers features a 0.02 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. 

To use the Sawyer Point Zero Purifier simply follow the instructions enclosed and affix the purifier to any bucket or pail to yield bacteria-free water in remote locations. The only external force required for the system to function is gravity. The flow rate of a purifier is determined by a combination of head pressure, altitude, and how clean the filter is. 

Absolutly no chemicals needed and is guaranteed for one million gallons. 

Sawyer is confident in their one million gallon claim because you can continually clean the filter by backwashing it with clean water. Backwashing is not required often unless you are filtering very turbid water. Backwashing is as simple as reversing the filter flow with clean water. Forcing the clean water back through the filter flushes out all of the contaminants and only takes a few seconds. NO REPLACEMENT FILTERS OR CARTRIDGES ARE NECESSARY.