PISTA forced-vortex grit removal systems from Smith & Loveless use advanced hydraulic control technology to provide fine grit removal across all flows, including 95-percent removal efficiency for grit particle sizes down to 100 microns. They combine specially designed inlet and outlet flumes, circular flat-floor chambers and integrated flow control baffles to create a forced hydraulic action that maximizes grit capture. They do not rely primarily on settling or gravity. Retrofit systems offer improved grit removal performance for existing 270-degree chambers (flat floor, sloped and cone-shaped) for less total investment than new systems. 800/898-9122; www.smithandloveless.com; Booth 2017