The first portable water filter - today a classic Made from top-quality, durable materials. This is why the pocket is suitable for the toughest of conditions and is the first choice for extreme adventurers like Mike Horn The Tried and tested ceramic depth filter removes bacteria, protozoa and other disease-causing agents. The principle: the micro-organisms cannot pass through the pores of the filter ceramic (0. 2 microns) because of their size (greater than 0. 2 microns = 0. 0002 mm) Unlike disposable filters, the ceramic can be cleaned several times - even in the field Improved, round pump handle for better ergonomics and an outlet hose which can be attached to water containers with a simple clip