Abstract: A method for continuously eliminating foreign matter, may have the following steps: a) through-flow of a reactor with waste water in a flow direction, b) adding of magnetic or magnetizable particles to a feeding point in the reactor, wherein at least one foreign matter is attached to the particles, c) separating of particles charged with foreign matter to another spot in the reactor, located opposite the feeding point in the downward flow direction by applying a magnetic field to the water flow for the transport of particles into a collecting area connected fluidic with the reactor and d) separating of the particles and the foreign matter connected to the particles from each other. A device may have a reactor receiving waste water polluted with pollutants, a collecting area for polluted magnetic or magnetizable particles, and may produce a magnetic field, transporting the particles into the collecting area.