A tube magnet is constructed of cylindrical permanent magnets contained within a thin stainless steel tube, generally 25 mm diameter. The length of the tube is usually manufactured to suit the specific location. The tube magnet is either installed singly or in multiples within the process, or built into grates, through which the food material flows. A typical grate composed of tube magnets. The grates themselves can be built into drawer type assemblies for manual removal to facilitate cleaning or can be arranged for automatic removal actuated pneumatically.