Can you share the pic? Could be a Vortex Type Grit removal Chambers,. Typically the git is collected in the lower grit chamber, which shall be pumped to a Hydro Cyclone to separate waster / organics / sand. 90 to 95% of the Water and Organics  are separated from the top of the cyclone, the remaining 5 to 10% of sand  slurry collected in the Screw Classifier, for final dewatering.

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Can you share the pic? Could be a Vortex Type Grit removal Chambers,. Typically the git is collected in the lower grit chamber, which shall be pumped to a Hydro Cyclone to separate waster / organics / sand. 90 to 95% of the Water and Organics  are separated from the top of the cyclone, the remaining 5 to 10% of sand  slurry collected in the Screw Classifier, for final dewatering.