The Wilo-Flumen OPTI-TR series is a direct-drive submersible mixer series with 5.5- to 15.75-inch-diameter propellers optimized for efficiency and durability. The series features cast stainless steel propellers (200 to 1,300 N thrust range) with the same hydraulically efficient backswept profile as found on the company’s medium-speed planetary gear-reduced mixer series. Each propeller blade has a hydrofoil profile that achieves thrust-power ratios according to ISO 21630. Propeller clogging is minimized through computational fluid dynamics-based design and extensive testing. A moisture-sensing electrode located in the seal chamber and auto-reset winding thermal sensors come standard. 888-945-6872; www.wilo-usa.com; Booth 2209.