Orthos Liquid Systems, Inc. is the industry leader in nozzle-based filtration systems and nozzle products for water and wastewater treatment applications—including conventional water treatment, BAF/BAC, GAC/IX contactors, wastewater tertiary filtration, and membrane pretreatment applications.

Our flagship Centurion™ monolithic underdrain system has delivered unmatched reliability for over 26 years—with zero system failures. Trusted and routinely specified by leading engineering firms nationwide, Centurion meets the demands of today’s utilities for resiliency, durability, and permanence.

Centurion serves as the foundation of the Poseidon Filtration System®, a comprehensive downflow filter solution that can include system controls, backwash troughs, air header piping, filtration media, pumps, blowers, valves, and instrumentation. Poseidon supports a wide range of treatment processes, including conventional filtration, BAF, GAC adsorption, ion exchange, and denitrification.

Orthos continues to drive innovation with offerings like the Proteus™ O3+BAF pilot system, Ortho-Wash™ stainless steel baffled troughs, Phalanx™ package gravity filters (available in painted or stainless steel), and our core line of high-performance filter nozzles and accessories.