The coolant to be cleaned must flow in a calmed manner (laminar) over the entire width of the receiving water, as in this way a high filtration efficiency is achieved. The coolant passes the magnetic roll in a radial direction. The FE particles and the particles adhering to the ferromagnetic parts are attracted and discharged by the rotating roll. The adjustable scraper plate is placed at an angle to the roller and allows the entrained fluid to run back while the particles are removed from the roller and fall into the collection container. Our compact, space-saving systems guarantee an extremely long functional life with virtually no maintenance.