a fibre pulp suspension where the fibre pulp suspension is applied to a convergent dewatering space arranged between two wires travelling in the same direction in the dewatering space water and powdery substance are removed from the fibre pulp suspension through the wires pressure pulses are generated in the fibre pulp suspension along the length of the dewatering space with pressure pulse elements that are on opposite sides of the wires relative to the fibre pulp suspension and in contact with or at a distance from the wires the invention also relates to an apparatus according to the method application_number US 81532804 A description 0019 fig1 is a schematic sectional side view in the travel direction of the wires of an embodiment of a prior art former the figure shows a first wire 1 which loops around guide rolls 1 a it also shows a second wire 2 which similarly loops as a closed loop around a hitch roll 8 and guide rolls 2 a and supported by which fibre pulp suspension 3 is conveyed in the web forming section while being dewatered in the figure arrows 4 schematically show the discharge of water a jet from a feeder chamber 5 is applied to a space between the first wire 1.