VF filler material has a higher efficiency than the inclined tube. The special structural design not only ensures rapid clarification but also uniform water distribution. The quick rising water is constantly changing direction and the activated sludge is trapped by inertia in the layers of the pack, further improving the efficiency of the solid-liquid separation.
At the same time, a stable, suspended sludge layer is formed by the upward flow of water. The treatment efficiency is greatly improved as the water intercepts the sludge layer and thorough contact condensation and the water quality of the effluent is stable.