Granular Media Filtration

Orthos Liquid Systems is the leading manufacturer
of nozzle-based filter systems and nozzle products
in water and wastewater treatment.


Poseidon Filtration System®

Poseidon is used for conventional water treatment, wastewater tertiary filtration, biologically active filtration, membrane pretreatment, GAC adsorption and ion exchange, as well as denitrification.

Filter Nozzles & Accessories

Orthos manufactures the broadest line of filter nozzle/strainers, with MILLIONS of combinations of screen slot sizes, thread types, flow characteristics, and air scour tube constructions.


Contact Orthos to get in touch with our industry experts


Potable water
Biologically Active
Wastewater Treatment System
Wastewater Treatment
Reverse Osmosis


Colorado Springs
Biological Filtration in Colorado Springs

Orthos Liquid Systems, Inc., helped save Colorado Springs Utilities (CSU) nearly $8MM through proof of doubling the biological filter flowrate at the Edward W. Bailey Water Treatment Plant (WTP) in El Paso County, CO. Early in plant design, pilot testing proved the plant could achieve a filtration rate of 12 GPM/ft2, more than double the state regulation standard rate for water treatment.

Claude “Bud” Lewis Carlsbad Desalination Plant
Claude “Bud” Lewis Carlsbad Desalination Plant

Orthos Liquid Systems, Inc. celebrated another extraordinary installation— this time at the largest desalination plant in the Western Hemisphere. The Claude “Bud” Lewis Carlsbad Desalination Plant, located adjacent to the Encina Power Station in Carlsbad, California, provides highly‐ treated water to businesses and residents in San Diego County since 2015. To meet the needs of this resource‐challenged area, Poseidon Water (owner) and IDE Technologies (designer/operator) created this economic and drought‐proof water supply alternative by tapping the largest reservoir in the world ‐‐ the Pacific Ocean.

Platte River West
Omaha Water Production Facility

Since the 1920s, MUD has provided high-quality drinking water for metro Omaha. MUD operates a water production facility (WPF) by the Missouri River northeast of Omaha and another on the Platte River south of the city. However, a third WPF was needed to keep up with twenty‐first-century demand. Commissioned in 2008, the Platte West WPF, located west of Omaha, created the Triangle of Reliability, surrounding the metro area with abundant drinking water system capacity for at least the next 30 years. The MUD looked to ORTHOS to assist in the addition.

Slide 3
Filtration Upgrade in Hurricane, Utah

Orthos Liquid Systems, Inc., helped Washington County Water Conservancy District (WCWCD) save millions of dollars through clever engineering design during last year’s filtration upgrade at the Quail Creek Water Treatment Plant (QCWTP) in Hurricane, Utah. Without adding any new filters, the facility can now process 60 million gallons per day (MGD) versus 48 MGD previously, a throughput increase of 25%.

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Latest Blog Posts

Triangular Underdrains

Tango Uniform – Triangular Underdrains

Triangular Underdrains, or using the military phonetic alphabet, “Tango Uniform” are a type of underdrain made of thin stainless steel sheet metal with laterals connected directly to a center flume or to an end flume box with gaskets.

Triangular Underdrain picture with Blog Title
Triangular Underdrains

Filter Media Loss Problems?

For over a half dozen years, Orthos has delivered granular media retention troughs for low-freeboard filters. Our Ortho-Wash™ baffled troughs are also used when sustained air-water backwash is needed, allowing the efficient combined cleaning process to run as long as necessary.

Filter Media Problems
Triangular Underdrains

What’s your acceptable failure rate?

For million-dollar water plant filters, why do people accept the documented and repeated failure of plastic block and triangular sheet metal lateral underdrains? And why keep specifying and purchasing the same failure-prone brands?

Underdrain failure rate
Triangular Underdrains

Buy American

Orthos is headquartered in the Great State of South Carolina and is fully compliant with the Buy American Act and American Iron & Steel requirements enacted by the US Government. Our co-located warehousing facility stocks and distributes thousands of filter components to promptly respond to our clients’ requirements.

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Please contact us so that we may help you with the selection of a nozzle that will work for a specific application.