Abstract: A suction dewatering system which includes a suction device adapted to be connected to a source of suction and having at least one longitudinal opening therein to which suction can be applied. The opening is positioned substantially perpendicular to the direction of medium travel across the suction device for dewatering thereof. An adjustable slot cover is provided for the suction device and includes a base. The base is mounted to the suction device in fixed position and has surfaces thereon forming spaced longitudinal lands and defining a longitudinal slot between each pair of adjacent lands in alignment with the suction device opening. A wear strip is removably positioned on each of the lands for engagement with the medium passing thereover. The wear strip on one of each pair of adjacent lands is stationary in respect to the direction of medium travel and the wear strip on the other of the pair of adjacent lands is automatically adjustable with respect to the direction of medium travel.