Abstract: A filtering system comprising an inlet (11) for liquid to be filtered and an outlet (9) for filtered liquid, as well as filtering means, which system is characterized in that the filtering means, placed in series comprise: a first filter (2) comprising activated carbon with the capability to also remove particles that are larger than approximately 0.5 ?m; an ultrafiltration membrane (5) for the removal of particles that are larger than approximately 0.02 ?m; a post-treatment filter (14) of activated carbon, optionally provided with a microfiltration membrane (13), wherein the system also comprises a vessel (6) for filtered water located between the ultrafiltration membrane (5) and the post-treatment filter (14), with the option of using the filtered water from the vessel for back-flushing the ultrafiltration membrane (5).

Abstract: A water filtering device suitable for locally, under atmospheric pressure, purifying contaminated water, and which comprises a container that is provided with an inlet opening and an outlet opening, which container is provided with at least: a preliminary filtration element for the removal of particles, if present, of a particle size more than 10 micrometers; a filtration element provided with activated charcoal; and an ultrafiltration element.