There is a lot of cool stuff coming out of Cascade Designs but this beats them all, hands down. The Guardian is not only a self cleaning water filter by using 10% of the filtered d water to comstant,y flush itself. It also meets NSF Protocol P248, used by the U.S. Military which means it will filter out viruses, bacteria and protozoa.
It uses a dual-acting pump head, capable of producing 2.5 liters per minute of potable water with minimal user effort. It is very easy to pump.
Ultrafiltration (UF) Membrane Technology
-0.02 micron pore size provides a true physical barrier for removing all suspended solids and microbiological contaminants (viruses, bacteria, and protozoa).
-High flow rates achieved at low pumping pressures.
-Dual-acting pump mechanism minimizes user effort but maximizes water production.
-Self-positioning pressure relief valve protects against over-pressurization of the UF filter cartridge.
-Ergonomic handle design has sufficient finger clearance for the purifier to be operated while wearing gloves.
Flow Rate 2,500 mL/min
Weight 16 oz.
Pump Rate 80 strokes per minute
Dimensions 2.8 x 4.6 x 8.2 inches
Viruses > 4 log reduction†
Bacteria > 6 log reduction†
Protozoa > 3 log reduction†
Filter Capacity > 10,000 L in clear water
> 600 L per NSF P248 standard
Operational Life 40 days based on a 15 L/day daily water consumption
Filter Shelf Life 5 years