Designed for travelers on the go, this self-contained purifier can be filled from a sink or pitcher, making it ideal for travel. Quick and convenient--no dangling hoses to contend with, no chemicals, no hold time or back-washing maintenance. Safely removes microbiological, chemical and aesthetic contaminants with its unique chemical-free purification process. Comfortable ergonomic pump handle with double-action pump supplies more water with less work. Easy, pour-through pre-screens remove larger contaminants. Particle retention 0.1 micron (normal), 0.4 (absolute); can purify up to 106 gallons of water (dependant on water source). A water-tight cap and padded Cordura® nylon carrying case make this filter easy to carry anywhere.