Dual pumping modes Removes particles Activated Carbon reduces chemicals Suitable for backpacking Glass fiber filter A simple turn engages a ceramic pre-filter for long life in dirty water or a pleated glass fiber filter in normal conditions Produces up to two quarts per minute in the faster flow mode and one quart per minute in longer life mode Replaceable carbon core keeps water tasting fresh; reduces chemicals, odors, and toxins throughout the life of the cartridge Dual piston technology provides maximum output with minimum effort Adapter base attaches directly to water bottles or an output hose can be used to fill hydration systems or larger containers