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This article highlights the application advantages of open impellers in chemical and wastewater industries. Compared to closed impellers, open impellers have no front/rear shrouds, featuring wider flow paths that resist clogging by solids, fibers, or crystallizing media—critical for these industries. Made of stainless steel via sand casting, they offer strong corrosion resistance, simplified maintenance (less disassembly needed), and customizable designs. In chemical plants, they handle aggressive fluids and reduce downtime; in wastewater treatment, they prevent blockages in sludge/solid-laden systems. Casting quality and structural optimization ensure hydraulic efficiency, durability, and stable long-term operation, meeting the industries’ demanding needs.