Hydro International is a worldwide supplier of environmentally sustainable products for the control and treatment of wastewater, combined sewer overflows, and stormwater in the municipal and industrial markets.


Hydro International's grit management product line is unsurpassed in the industry in performance. Hydro International can provide systems with guaranteed performance removing 95% of grit 75 micron and larger, with less than 20% attached Volatile Solids. Hydro's wastewater product line includes:

Grit Separation

  • HeadCell® - stacked tray grit separation
  • Grit King® - structured flow grit separation

Grit Washing

  • SlurryCup™ - free vortex grit washing and sludge degritting 
  • TeaCup® - advanced grit washing 

Combined Washing & Dewatering 

Grit Dewatering

Pretreatment - Sludge Screening, Sludge Degritting, and Rotating Belt Filtration


Hydro International's Wet Weather control and treatment products are the industry's foremost collection of solutions that can meet the most stringent of regulatory requirements. Hydro's products are simple, robust and effective operating with minimal maintenance. Hydro International's CSO and SSO control and treatment solutions are:


Hydro International's stormwater solutions maximize efficiency and minimize land take with as little as 1/5th the footprint of conventional stormwater technologies. Hydro's stormwater product line includes:

  • Downstream Defender® - compact, low maintenance stormwater BMP
  • First Defense® - stormwater sediment, trash, and floatables capture
  • Up-Flo® Filter - sedimentation, screening, and filtration 
  • Hydro DryScreen™ - baffle box that captures sediment and screens trash and other solids
  • Stormcell® - high-capacity, low-maintenance modular stormwater and surface water storage system


Remove more, finer grit to protect downstream treatment equipment, increase plant efficiency and cut maintenance and repair costs. The HeadCell® is a stacked tray grit, sand and solids separator that captures and retains 95% of all wastewater grit 75 micron (µm) and larger. With a small footprint, no electrical requirements and no moving parts the HeadCell® delivers exceptional and economical solids removal for small, medium or large wastewater treatment plants.

Remove fine grit to protect downstream processes at small, medium or large wastewater treatment plants. The Grit King® is a compact, unpowered advanced grit management system that removes 95% of 106 µm solid particles or larger, preventing the costly downstream abrasion and deposition caused by grit, silt, and sand. With no moving parts, requiring less than 6 in of headloss at average flows and a capacity to handle flows as low as 0.25 MGD, the Grit King® is a versatile and economical grit removal system that helps owners and operators to cut plant maintenance costs.

Capture, wash and classify very fine grit to protect downstream processes from abrasion and deposition.

Remove, separate, classify and wash wastewater and process solids at a range of municipal and industrial treatment plants. The TeaCup® is a high-performance accelerated gravity grit removal system that has set the standard for high-performance headworks grit management since 1976.

Cut landfill costs and reduce odor issues with cleaner, drier grit.

Get efficient, economical grit dewatering at smaller plants with no washwater requirements.

Get superior non-turbulent grit dewatering, optimized for fine wastewater grit.

Get economical wastewater grit dewatering even at small treatment plants.

Remove, compact and dewater solids from sludge to cut maintenance, reduce handling costs and increase biosolids value.

Drastically reduce the cost, footprint and energy consumption for industrial and municipal wastewater and process water treatment.

Prevent 100% of combined sewer floatables and gross solids and 95% of grit and sediment from reaching the environment.

Capture gross solids and floatables at CSO sites with infrequent overflows.

Screen gross solids and floatables at small and medium-size CSO facilities.

Get high-performance, low-footprint CSO screening even under challenging overflow conditions.

Safely convey water or sewage while protecting infrastructure from damage, vibration, odor and noise.


Capture and retain sediment, oils and floatables from stormwater runoff over a wide range of flows in a small footprint.

Capture and retain stormwater sediment, trash and floatables in a unit that saves site space and adapts to smaller or logistically difficult site locations.

Capture sediment, heavy metals, oil and nutrients from stormwater while reducing your site footprint and cutting maintenance costs.

Screen and capture stormwater trash, organic matter and sediment, then store it dry to prevent nutrient pollution.

Store and infiltrate surface water and stormwater even on difficult or irregular sites.


Hydro International

2925 NE Aloclek, Suite 140

Hillsboro, OR 97124


Phone: 866.615.8130

Contact: Ben Paetel


  • Complete Grit Removal And Sludge Screening Solution Protects And Optimizes Plant Performance In Conway, Arkansas

    An aging wastewater treatment plant had the potential to impact the water quality of a 6,700 acre man-made fishing lake near Conway, Arkansas. The city needed a new treatment facility that was consistent with pending permit limits.  Read the full case study to learn more.

  • HeadCell Project Wins 2018 DBIA Award of Excellence

    Each year the Design Build Institute of America (DBIA) selects the best large-scale Design-Build projects in the United States in a wide variety of infrastructure categories. Atlanta, Georgia’s R.M. Clayton Water Reclamation Facility (WRF) headworks upgrade project featuring HeadCell® grit separation won the coveted 2018 DBIA National Excellence Award in the Water and Wastewater category. Read the full case story to learn more.

  • Littleton Installs The Ultimate Grit Removal System For Total Plant Protection

    The Littleton / Englewood Wastewater Treatment Plant, just south of Denver, is the third largest publicly owned treatment works in the state of Colorado. It receives sewage from the cities of Littleton and Englewood, as well as 21 connector districts in a 75-square-mile service area. Farmer’s staff chose to implement an upgraded grit removal system supplied by Hydro International. Two complete HeadCell® systems were implemented – each consisting of one HeadCell® grit separation unit, one SlurryCup™ grit washing unit, and one Grit Snail® grit dewatering escalator. Read the full case study to learn more.

  • Hydro-Brake Drop Cuts Corrosion, Complexity And Cost For Saudi WWTP Project

    Saudi Arabia's National Water Company needed to transport sewage from Riyadh to the wastewater treatment plant (WWTP) at Al Haer. Read the full case study to learn how Hydro International worked with ILF Consulting Engineers to develop an alternative design using three Hydro-Brake® Drop systems.

  • Fox Lake's WWTP Retrofit Improves Performance And Increases Capacity

    The existing aerated grit basin (AGB) grit removal system at Fox Lake, IL, was at the end of its useful life and needed to be replaced. There were two requirements for the replacement: they wanted to retrofit the new equipment in the existing area and to eliminate grit deposition in the grit basin which was very difficult to remove. Steve Vella, Fox Lake’s plant Supervisor, saw the HeadCell® at WEFTEC in Chicago. He liked the stacked tray concept, and thought it would be the ideal solution to their plant’s grit problem. He had seen similar operational principles in lamella systems. The stacked tray design would allow them to increase their surface area which would increase their grit system performance, while staying within the existing area used by the AGB.

  • HeadCell Eliminates Chandler, AZ's Punishing Grit Problem

    Rapid population growth created the need for a plant initially designed for 5 MGD to expand four times over two decades to treat 27 MGD today. With no grit removal the plant struggled with grit since start-up, spending hundreds of thousands of dollars on contractors to remove accumulated grit every 2-3 years. The plant wanted to eliminate their grit problems once and for all. Tired of wasting money, time, and effort on this futile but necessary task, the plant hired Wilson Engineers to evaluate various grit removal technologies to determine which type of system would be capable of eliminating their grit problem.

  • Columbus, GA Storm King Satellite Treatment Significantly Reduces Project Costs

    The City of Columbus, GA knew firsthand the pollution problems that combined sewer systems caused. In dry conditions, the city’s combined sewer overflows (CSOs) were not a problem, but during heavy rain events the rapid influx of stormwater caused the system to overload — resulting in untreated water to flow directly into the Chattahoochee River. The river provides drinking water for over half of all Georgians and recreational opportunities for more than 25 million people each year. Not only did the overflows cause exceptionally high fecal coliform levels in the hundreds of thousands of colony forming units (CFU), they also discharged aesthetic pollutants directly into the river.

  • Sludge Screening Increases Sludge Quality, Improving Cogeneration

    The Central Valley Water Reclamation Facility was built in 1988 and serves a total population of over 550,000 in Salt Lake County. Central Valley’s entire property covers 168 acres (0.7 km) with the treatment facility using 85 acres. The facility has over 80 dedicated employees and treats a peak daily flow of 85 Mgal/d (3724 L/s). In 2009, one of the two existing sludge screens was replaced with the Hydro-Sludge® Screen manufactured by Hydro International. The replacement unit was installed with little modification to the existing piping and support structure. The unit has been in operation with exceptional results. Read the full case study to learn more.

  • Green Lakes, WI, HeadCell Protects Downstream Processes

    The original plant in Green Lakes, WI, was built in 1983 and did not include grit removal. As a result, grit accumulated throughout the plant process tanks, particularly the aeration basin. This required periodic shutdown of the process tanks and hiring a contractor to vacuum the deposited grit from the tanks. The pending upgrade would include the use of an SBR treatment system as well as an upgrade to sludge dewatering. Plant personnel were concerned about grit settling in the process tanks, as well as grit wearing on the belts and rollers of the new belt filter press that would be used for sludge dewatering. The impact of these problems drove the plant to include grit removal in their upgrade project.

  • Grit’s True Impact On Wastewater Treatment Quality And Costs

    Grit buildup that is ignored or improperly addressed can have profound effects on both treatment efficiency and maintenance costs, even if it does not impact effluent quality. Here are some of the cost implications and physical effects of inefficient grit removal, along with some important considerations on the impacts of letting grit go unmanaged.


  • Hydro GritCleanse Fluidized Bed Grit Washing and Dewatering

    Optimized fluidized bed grit washing from Hydro International now provides cleaner and drier fine grit than ever before backed by Hydro International's industry leading performance guarantee. Ideal for new wastewater treatment plants (WWTP) retrofits and to reduce organic volume sent to landfill.

  • How Hydro International’s Grit Dewatering Technologies Work

    The Grit Snail® is a quiescent dewatering belt escalator that captures and dewaters the fine grit output from a HeadCell®, SlurryCup™ or TeaCup® grit removal system. Providing solids output with low water content, the Grit Snail® reduces solids handling and landfill costs.

  • Grit Washing Technologies From Hydro International

    The SlurryCup™ uses two levels of separation and classification to capture, wash and classify grit as small as 75 µm from grit slurries, primary and secondary sludge, protecting downstream processes from abrasive wear and clogging.

  • Grit Separation Technologies From Hydro International

    Learn more about the phenomenal performance of Hydro International's industry leading HeadCell and Grit King separation systems.