A pulp suspension washer press (101; 201) comprising: a. at least one drum (105; 205) having an exterior drum surface (130; 230) disposed within a vat (155; 255); b. a pulp distributor (109; 209, 301) having a drum inlet (115; 215) adjacent to the drum (105; 205); c. at least one pulp slide plate (135; 235) adjacent to the exterior drum surface (130; 230); d. a trough (120; 220) having two sides and two ends, wherein said trough sides comprise the exterior drum surface (130; 230) on one side and the vat (155; 255) as the other side, and said trough ends comprise the drum inlet (115; 215) on one end and a final nip (150; 250) at the other end; and e. at least two displacement wash zones (145, 146; 245, 246) within the trough (120; 220), wherein said displacement wash zones each have a first end and a second end, characterized in that each first and second end of said displacement wash zones comprises or is adjacent to a nip (125, 126, 150; 225, 226, 250), a first one (145; 245) of the at least two displacement wash zones comprises a primary nip (125; 225) and a secondary nip (126; 226) and is defined by a second pulp slide plate (136; 236) and the exterior drum surface (130; 230) as the sides, wherein wash water or other liquid is introduced in the first displacement wash zone so as to allow the solids within the pulp suspension to be washed and continually dewatered as they pass the length of the first displacement wash zone (145; 245), a second one (146; 246) of the at least two displacement wash zones comprises the secondary nip (126; 226) and the final nip (150; 250), wherein wash water or other liquid is again added to the second displacement wash zone, and the width of each nip within the trough (120; 220) is less than the width of the remainder of the respective trough sections comprising the at least two displacement wash zones. a. at least one drum (105; 205) having an exterior drum surface (130; 230) disposed within a vat (155; 255); b. a pulp distributor (109; 209, 301) having a drum inlet (115; 215) adjacent to the drum (105; 205); c. at least one pulp slide plate (135; 235) adjacent to the exterior drum surface (130; 230); d. a trough (120; 220) having two sides and two ends, wherein said trough sides comprise the exterior drum surface (130; 230) on one side and the vat (155; 255) as the other side, and said trough ends comprise the drum inlet (115; 215) on one end and a final nip (150; 250) at the other end; and e. at least two displacement wash zones (145, 146; 245, 246) within the trough (120; 220), wherein said displacement wash zones each have a first end and a second end, characterized in that each first and second end of said displacement wash zones comprises or is adjacent to a nip (125, 126, 150; 225, 226, 250), a first one (145; 245) of the at least two displacement wash zones comprises a primary nip (125; 225) and a secondary nip (126; 226) and is defined by a second pulp slide plate (136; 236) and the exterior drum surface (130; 230) as the sides, wherein wash water or other liquid is introduced in the first displacement wash zone so as to allow the solids within the pulp suspension to be washed and continually dewatered as they pass the length of the first displacement wash zone (145; 245), a second one (146; 246) of the at least two displacement wash zones comprises the secondary nip (126; 226) and the final nip (150; 250), wherein wash water or other liquid is again added to the second displacement wash zone, and the width of each nip within the trough (120; 220) is less than the width of the remainder of the respective trough sections comprising the at least two displacement wash zones. each first and second end of said displacement wash zones comprises or is adjacent to a nip (125, 126, 150; 225, 226, 250), a first one (145; 245) of the at least two displacement wash zones comprises a primary nip (125; 225) and a secondary nip (126; 226) and is defined by a second pulp slide plate (136; 236) and the exterior drum surface (130; 230) as the sides, wherein wash water or other liquid is introduced in the first displacement wash zone so as to allow the solids within the pulp suspension to be washed and continually dewatered as they pass the length of the first displacement wash zone (145; 245), a second one (146; 246) of the at least two displacement wash zones comprises the secondary nip (126; 226) and the final nip (150; 250), wherein wash water or other liquid is again added to the second displacement wash zone, and the width of each nip within the trough (120; 220) is less than the width of the remainder of the respective trough sections comprising the at least two displacement wash zones.