The Hubert clarifiers remove sludge efficiently from primary and secondary settling tanks.

The most common clarifier is executed with a triangular aluminium bridge, with walkway, across the tank. The bridge is supported on a two-wheel peripheral drive unit and a trust bearing in the centre of the tank. The parabolic bottom scraper blades are suspended from the bridge. A scum scraper at water level is mounted on the bridge and directs the scum into the scum discharge.