Constant Part IV

The invention relates to a method and an arrangement for producing a finished pulp suspension for producing a paper, board, tissue or another fibrous web (9) by mixing at least one formed by re-treated fiber and filler high-consistency stream (1) having at least one of a fresh water, white water o.. Low consistency flow (2) formed in a machine for producing the fibrous web (9). The effort to be reduced in that at least the high-consistency stream (1) and at least a portion of the low-consistency stream (2) after the purification of the high-consistency stream (1) this is mixed.