Hydro GritCleanse
Traitement des eaux usées

Hydro GritCleanse

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

The Hydro GritCleanse™ is a fluidized bed grit washing and grit dewatering system that significantly reduces Volatile Solids (VS) content to produce cleaner, drier grit. Cutting VS levels in wastewater grit product reduces weight, volume, and water content—which significantly reduces odor issues and saves you money on disposal.  

Brought to you by the pioneers in fine grit removal, the Hydro GritCleanse™ retains 95% of all grit 75 micron and larger and outputs washed grit with less than 5% VS and is the only fluidized bed grit washing technology that can be offered with our industry-leading performance guarantee.

Hydro GritCleanse™ significantly reduces Volatile Solids (VS) content to produce cleaner, drier wastewater grit—reducing weight, volume, and water content to reduce odor issues and reduce landfill disposal costs.

The Hydro GritCleanse™ works best when paired with our industry-leading grit separation systems like the HeadCell® and Grit King® to provide a complete advanced grit washing and dewatering system. A grit removal system is only as strong as its weakest link; for this reason, we focus on providing complete grit systems that output a cleaned, dewatered product that is ready for cost-effective disposal. The Hydro GritCleanse™ optimized grit washing and grit dewatering process allows plants to significantly reduce volatile solids and output grit with less than 5% VS.

Each part of our grit removal process is designed to complement and capitalize on the performance of the other elements. This allows us to simplify design complexity, expedite installation and guarantee performance with single supplier accountability.

The Hydro Grit Cleanse™ is backed by over 40 years of experience providing industry-leading grit removal performance coupled with single supplier system accountability using our Advanced Grit Management® approach to grit system design. The result is an optimized fluidized bed grit washing system designed for easy maintenance and operation.   


  • Grit washing where very low volatile solids are required
  • New wastewater treatment plants
  • Treatment plant retrofits
  • Replacement for worn out or ineffective grit washing and dewatering systems

Reduced organics reduces operating costs

Reducing organic material in captured grit reduces volume, weight, water content and odors. Cleaner grit retains less moisture and allows it to drain away. This results in less material that needs to be landfilled – significantly reducing disposal fees, hauling and handling fees and the resources needed to deal with it.

Single supplier accountability guarantees grit system performance

Bundled grit separation, washing, and dewatering from a single manufacturer simplifies maintenance and operational questions and provides a single point of contact to ensure that the entire grit removal process can protect your plant. A single supplier eliminates finger pointing with different manufacturers blaming the others for any problems. Hydro International provides complete grit removal systems with no weak links. A single supplier also ensures that your entire grit removal system is always operating at peak efficiency with optimized performance.   

Reduced odor = happy operators & neighbors

Disposing of grit is usually performed as a batch process. Grit is often left in open air dumpsters until enough is collected to warrant disposal. High organic content grit can lead to significant odor issues and an unpleasant environment for operators. The Hydro GritCleanse™ system outputs grit that has less than 5% Volatile Solids. Additionally, the Hydro GritCleanse™ is fully enclosed, further reducing odor issues.

Optimized to work with HeadCell® and Grit King® separation 

The Hydro GritCleanse™ is the only fluidized bed grit washing system specifically designed to work with the industry’s best performing advanced grit separation systems the HeadCell® and Grit King® and is designed to fully capitalize on their phenomenal performance. When a Hydro GritCleanse™ system is paired with our grit separation technology we can guarantee entire system grit removal performance. 

Designed for easy maintenance

All stainless-steel construction and heavy-duty design ensures durability even in outdoor operation. The Hydro GritCleanse™ uses a shafted screw design with an external lower bearing. Unlike classifiers with shaftless screws there is no need for liners or steel wear bars that often need to be cut out to be replaced, requiring a complete disassembly of the unit. Instead, the Hydro GritCleanse™ is equipped with a long lasting 4-bolt lower bearing that can be accessed and serviced from the outside of the trough saving both money and downtime. Shafted screw design reduces wear and eliminates the need to replace wear bars or liners. The dewatering screw pivots to allow easy access for maintenance. Rinse water is injected via nozzles which are accessible externally. Other systems use neoprene membranes to introduce rinse water, but membranes are subject to fouling when using non-potable water. The membranes are also typically stacked within the screw/clarifier assembly which requires complete disassembly for maintenance.

Tangential feed improves performance

Feeding the clarifier at the tangent allows the Hydro GritCleanse™ to immediately put grit in direct contact with the clarifier surface and establishes a rotary flow pattern. Grit is caught in the boundary layer as it settles to the bottom of the unit into the gently agitated fluidized bed. Washers that feed at the clarifier center force the grit particles to travel a significant distance to reach the clarifier surface. This allows more opportunity for finer/slower settling grit to be carried out with the effluent.


Flow is introduced tangentially into the conical clarifier forcing grit to contact the vessel walls creating drag forces and establishing a rotary flow pattern. Incoming grit settles into the low velocity boundary layer at the inside wall of the vessel. The structured, laminar flow pattern allows retention of fine and slowly settling grit particles while the interior baffle prevents short-circuiting.

Once in this boundary layer grit is further decelerated and settles to the bottom of the unit into the gently agitated fluidized bed where physical forces separate fixed and volatile solids by density. Grit settles to the bottom of the bed while the lighter organic material carries out with the effluent. Large organics remain in suspension at the top of the bed and are intermittently discharged via an adjacent port on a timed basis.

Washing occurs in the fluidized bed as organic material attached to the grit particles is scrubbed away due to friction between particles and the higher density grit descends to the bottom. Washed grit is discharged intermittently based on bed pressure via the dewatering screw.

Watch this animation to see how the Hydro GritCleanse™ works.

New! Hydro GritCleanse Animation


Hydro International offers the Hydro GritCleanse™ in different sizes to accommodate our customers' requirements and preferred balance between flow capacity and performance. Flow capacity and performance of our two most common system sizes is reflected in the following table.  

Hydro GritCleanse Performance & Capacity


  • Multiple sizes / capacities available
  • Hydraulic capacity up to 800 gpm (50 L/s)

  • Hydro GritCleanse render
  • Hydro GritCleanse discharging grit
  • Side view operating Hydro GritCleanse
  • Clean, dry grit output from Hydro GritCleanse
  • Close-up grit discharge chute
  • Hydro GritCleanse paired with HeadCell
  • Discharging into grit dumpster
  • Outdoor Hydro GritCleanse Installation
  • Operating Hydro GritCleanse system
  • Testing configuration Hydro GritCleanse

What are the clearance requirements on the Hydro GritCleanse?


The Hydro GritCleanse™ requires 3 feet (0.9 m) around the unit for maintenance. Additionally, clearance must be provided to allow the auger to swing out for maintenance. The rotating auger trough simplifies routine maintenance significantly compared to conventional fluidized bed grit washing systems.


Does the Hydro GritCleanse work with the HeadCell and Grit King?


The Hydro GritCleanse™ works best with Hydro International's Advanced Grit Separation technologies the HeadCell® and Grit King®. The system is the only fluidized bed grit washing system specifically designed and configured to capitalize on the phenomenal separation performance of both HeadCell® and Grit King®. This provides plants with the benefit of single supplier accountability in a single process that ensures your grit system will provide the protection your plant needs. 


How is the Hydro GritCleanse different than conventional fluidized bed grit washers?


The Hydro GritCleanse™ is designed to address and eliminate the shortcomings of existing fluidized bed grit washing systems, particularly expensive and time consuming maintenance. The system is optimized to significantly reduce the maintenance burdens of plants operating fluidized bed grit removal at their plant. 

HeadCell + Hydro Grit Cleanse = Ultimate Performance

HeadCell® provides unmatched grit separation performance, the Hydro GritCleanse™ provides unparalleled washing performance. Together you can now have the best performing grit system on the market with single supplier accountability. 


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