The slurry is fed into the system through a feeding cylinder. The slurry settles freely in the raking zone, where it is further concentrated under the pressure of the scraper. The rakes gradually push the slurry toward the center of the tank, and under gravity, the concentrated material is discharged into the next layer of the tank. Clean water enters the bottom layer through a distribution box for washing the material. The overflow from the lower layer sequentially returns to the distribution box and enters the upper layer for washing. The overflow from the first layer is discharged through an overflow weir, while the washed material is discharged from the bottom.

Primarily used for counter-current washing in gold cyanidation processes. It can also be applied in hydrometallurgy, light industry, and chemical processes for washing and dewatering operations.