The Hydro GritCleanse™ is a fluidized bed grit washing system that 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 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


Watch a brief video showing the Hydro Grit Cleanse in action here. Download the Hydro GritCleanse™ brochure here

Designed for

Fine particles
Medium flow


Reducing 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 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 ensures that your grit removal system is always operating at peak efficiency with optimized performance.   

Reducing 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

By feeding the clarifier at the tangent the Hydro GritCleanse™ immediately puts the grit in 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.

How it works

How it works

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.

Hydro GritCleanse How it Works



Technical information

Technical information


  • Removes 95% of particles equal to or greater than 75 µm with a specific gravity of 2.65 and larger at the design flow rate
  • Maximum 5% volatile solids and less than 15% water content in output grit



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

Hydro GritCleanse Components




Case Studies

Case Studies