The Lefilter multi-column auto-backwash filter is a fully automatic, high-efficiency filtration device widely used in metallurgy, chemical, petroleum, paper, pharmaceutical, food, mining, power, municipal water supply and other industries. It is specially designed for industrial chilled water, wash water, wastewater and circulating water treatment, such as continuous casting water systems, blast furnace water systems and hot rolling high-pressure water systems in metallurgy, providing an advanced, efficient and easy-to-operate solution for uninterrupted water treatment.