Ambica Metal Works The Contaminated coolant from the machine sifted into the inlet of magnetic filter. As its passes through the gape between the drum and the body; the dust particules are arrested by the magnetic drum. A synthetic rubber roller mounted on springs, squeezes the dust and allows only dry powder, which is furhter scraped out from the drum by scraper and is collected in the dust collecting tray. The filteration level achieved will be almost 95% for ferrous particles.