The TeaCup® is a high-performance accelerated gravity grit removal, separation, classification, and washing system that has set the standard for high-performance headworks grit management since 1976. Optimized for grit collection, grit washing, sediment removal on pumped flows and for classifying and washing grit on systems where batch discharge is required, the TeaCup® addresses both municipal and industrial solids removal challenges, and the capital investment has been shown to pay for itself in as little as two and a half years.

Removing over 95% of wastewater abrasives to cut deposition and reduce mechanical wear, TeaCup® reduces downstream maintenance and repair and can reduce solids handling costs by as much as 50%


  • Municipal wastewater treatment plant (WWTP) grit removal
  • Surface water pretreatment
  • Industrial process water recycling and reuse
  • Snail shell removal 

Watch a brief video demonstrating the TeaCup®  here. Download the TeaCup® brochure here.

Designed for

Fine particles
Industrial materials
Very fine particles


Reduce footprint and save money on electricity

The compact design of the TeaCup® requires up to 80% less area than conventional grit systems, which frees up valuable plant space for other processes. Aside from low energy solenoids and an actuator that only needs to operate as infrequently as once every 8 hours (for 3 minutes), the all-hydraulic TeaCup® requires no additional electricity to provide phenomenal grit removal performance. 

Reduce downstream wear and maintenance 

With guaranteed performance and removal rates of up to 95% of wastewater abrasives you can be confident that the TeaCup® will reduce downstream deposition and significantly reduce excessive mechanical wear - cutting annual maintenance and repair costs. 

Increase your downstream solids handling capacity 

Without the protection of a Hydro International Advanced Grit Management™ system, grit accumulates in downstream processes and these processes serve as grit storage - clogging them and significantly decreasing their capacity. Additionally, excess capacity needs to be available to manually remove uncaptured grit that has deposited. With the TeaCup® you cut out the grit upstream, reducing downstream accumulation and reducing the need to pay for expensive process capacity to store your grit. 

How it works

How it works

TeaCup Cutaway
The TeaCup® uses a combination of a free vortex and the accelerated gravity boundary layer effect to capture, classify, and remove grit, sugar sand, and high-density fixed solids. The TeaCup® discharges a clean, low organic grit slurry, which emits fewer odors and requires only dewatering to meet stringent disposal regulations.

  1. Flow enters the stainless steel vessel tangentially at a controlled rate and velocity.
  2. The flow regime established in the device forms a vortex, which results in high forces and a thin, predictable boundary layer.
  3. Grit is forced to the outside perimeter or held in suspension until it falls by gravity into the boundary layer, which sweeps the grit, but not volatile solids, into the collection chamber at the bottom of the unit.
  4. The concentrated slurry is collected in the chamber at the bottom of the unit.
  5. Periodically, fluidizing water is added and the grit is purged from the system.
  6. The slurry discharged is clean and ready for dewatering.
  7. The water containing the volatile solids exits the top and returns to the plant for treatment.


Technical information

Technical information

Performance characteristics

Removal rate

  • Removes 95% of grit particles 75 micron and larger at the design flow rate


  • Outputs less than 20% volatile solids 
  • Greater than 60% total solids 


  • Handles flows of between 70 gpm to 8 MGD 
  • Solids concentrations up to 1.5%

Unit size

  • Single unit diameters range from 24" to 96"

Design notes 

  • Open free vortex design 
  • Simple operation, long product life
  • Large diameter easily handles peak flow volumes without clogging
  • Prefabricated modular components provide simple installation and maintenance 
  • Discharges a clean grit slurry, with low volatile solids 
  • Suitable for batch processing operation 
  • Standard turndown ratio of 3:1 peak to average daily flow


Case Studies

Case Studies