PURITAN MAGNETICS' rotating drum magnets are designed for continuous self-cleaning of ferrous materials from product flow streams. As product enters the housing inlet, a adjustable feed gate meters the flow of product to the drum face. The drum has a stationary internal magnet with an outer drum that rotates. When product passes over the magnetic field, ferrous materials are attracted to the drum surface where they are safely held on to until the ferrous material passes through the magnetic field where it is discharged to the rear of the housing. Cleaned filtered product is discharged to the front of the housing.