Grit King® is a compact, unpowered Advanced Grit Management system that removes 95% of 75 µm particles or larger, protecting wastewater treatment plants (WWTPs) from the expensive impacts of grit abrasion and deposition.

Delivering exceptional hydrodynamic separation in a single unit with no moving parts and no external power requirements, the Grit King® provides superior grit removal with low operational and maintenance requirements. Capable of handling flows as low as 0.25 MGD with a single unit—and virtually any flow with multiple units—Grit King® is ideal for small, medium or large treatment facilities.

Available as a free-standing unit, the Grit King® provides a flexible option for plants with small, elevated inlet works—a configuration that can eliminate the need for a grit pump—and if the turndown ratio is less than 3:1 grit washing and dewatering is also not required.

In addition to municipal wastewater, the Grit King® can be used for pre-treatment in potable water applications and for sediment removal in industrial wastewater.


  • New wastewater treatment plants
  • Wastewater treatment plant retrofit projects
  • Grit removal for potable water
  • Grit removal for industrial effluents 

Watch a brief video demonstrating the Grit King® here. Download a brochure covering the Grit King® here.

Industrial applications

Visit our industrial microsite to learn how products like the Grit King® can help industrial businesses.

Designed for

Coarse particles
Fine particles


Cut energy costs

Energy costs are one of the biggest expenses that wastewater treatment plants face. While the Grit King® requires no electricity to operate, even more substantial energy savings are realized by protecting downstream aeration systems from being clogged by grit which significantly increases the power required to run the blowers.

Reduce maintenance costs

With 95% removal of 75 µm particles and larger, the Grit King® prevents grit from reaching downstream processes, protecting them against the clogging and abrasion wear that results in increased cleaning, maintenance, repair, and replacement parts.

Get grit removal designed (and guaranteed) to fit your needs

Available in free standing or in-situ configurations, the Grit King® can be easily linked to your existing processes. Numerous inlet, outlet, and elevation configuration options minimize installation costs by seamlessly fitting into your existing plant layout.  The compact design requires minimal headloss to operate and performance is guaranteed to meet your plant’s needs.  

Get unparalleled performance in a durable design

Moving parts such as paddles and motors can cause maintenance nightmares, but the Grit King® is a low-velocity, all-hydraulic design in a single vessel with no moving parts. This provides exceptional durability while eliminating the wear, repair, and replacement parts costs inherent to other more conventional systems. 

How it works

How it works

  1. Flow is introduced into the Grit King® via a tangentially positioned inlet causing a rotational flow path around the dip plate.

  2. The flow spirals down the wall of the chamber as solids settle out by gravitational and rotational forces (yellow arrow).

  3. The grit collects in the grit pot as the center cone directs flow away from the base, up and around the center shaft into the inside of the dip plate (blue arrow).

  4. The upward flow rotates at a slower velocity than the outer downward flow. The resulting "shear" zone scrubs out the finer particles.

  5. The concentrated grit underflow is pumped or gravity fed to a grit classifier for dewatering.

Grit King - How it Works



Technical information

Technical information


Removal rates

  • Removes 95% of grit particles 75 µm and larger at the design flow rate
  • <20% Volatile Solids when paired with a Hydro International washing and dewatering system
  • >60% Total Solids when paired with a Hydro International washing and dewatering system


  • <12" headloss at peak flow 
  • <6" headloss at average daily flow


  • Single units can handle flows as low as 0.25 MGD
  • Multiple units can handle virtually any flow
  • Turndown ratios for a standard design are 4:1 from peak to average
  • Turndown ratios in excess of 15:1 can be accommodated

Design notes

  • 304 or 316 stainless steel construction
  • For larger applications (typically flows over 10 MGD peak) the specialized internal components can be mounted in a concrete chamber


Case Studies

Case Studies