Turn rain, lake, and river water into drinkable water immediately! Ideal for: Hiking, Fishing, Hunting, Survival, Military, Foreign Travel, Emergency, etc. This water filter is the lightest, smallest water filter. It"s a good choice for soldiers, hiking, camping, fishing, hunting, climbing, trip/ travel, out-door work, survival, emergency and also refugee and rescuer in earthquake or flood area etc. And it is also an affordable source of drinking water for people who live in the conflict area, riot area, remote village and tribe. Also, it"s very easy to operate: just pump the handle to instantly remove dangerous contaminants from drinking water. Characteristics: (1) Unique dual ceramic membranes cartridge. Entirely removes bacteria in water like Escherichia coli, Staphylococcus aureus, Salmonella typhi, Vibrio cholerae, Legionella pneumophila, Giardia intestinalis. Filters out particles down to 0.1 micron - compare to the best commercially available unit that can only filter down to 0.2 micron! Entirely removes suspended contaminants of protozoa, algae, worms, dusts, etc. (2) Nano-metal clusters media Highly efficiently removes heavy metal ions in water such as Pb2+, Cd2+, Cr6+, As3+, etc. Efficiently decreases organic pollutants. Having a good ability to remove odors and cloudiness. Cleaning method: If the filter pores of the ceramic are clogged, the ceramic needs to be cleaned. Remove ceramic cartridge by turning ceramic cover counter-clockwise. Clean the ceramic with water, if necessary with the supplied abrasive paper.