Scraper Automatic Filter uses European stainless steel wedge wire screen with a set of fully automatic whirling scrapers. The scrapers work with a speed reducing motor to clean the impurities off the surface of the screen and lower the clogging rate to achieve the best filtration quality. The scraped impurities settle at the purge chamber which works with a set of discharge valve. The Timer in the control box (which can be adjusted) or the pressure differential detection device makes the valve discharge the impurities automatically which can keep working in high quality and efficiency without worker‘s operation.