Ortho-Wash troughs with media retention baffles from Orthos Liquid Systems prevent media loss in conventional filter applications using concurrent air-water media cleaning. Anthracite or GAC lifted by air scour is retained, settles and doesn’t flow over the trough weir. The baffles, integrally mounted onto the backwash trough, prevent media loss by deflecting air to provide this adjacent quiescent volume to settle out lightweight anthracite or GAC. Negligible media loss occurs when air scouring and backwashing at prescribed rates. The troughs are one part of the Poseidon Filtration System. 843/987-7200; www.orthosnozzles.com