A dewatering device comprised of a multiple drum and conveyor system, the device has two or more roller drums about which an endless supporting belt is located to provide a movable supporting area between the rollers. The belt supports a filter medium which also passes about the rollers. The belt has a number of apertures allowing passage of liquid through the filter medium and below the belt. The belt is also formed with a series of transverse troughs which help guide the mixture toward the apertures situated in the troughs. A vacuum chamber (i.e. a “suction box”) is placed under the belt between the rollers and forms a pressure gradient through the cloth and belt to suck the liquid from the mixture via the cloth and apertures.