Arrangement for liquid treatment of pulp

An apparatus for treating a pulp suspension with a treatment liquid comprising a continuous pervious belt for receiving said pulp suspension and moving said pulp suspension through a treatment zone in a predetermined direction, treatment liquid supply means located above said continuous belt in said treatment zone for supplying said treatment liquid onto said pulp suspension as it travels through said treatment zone in said predetermined direction, and collection means located below said continuous belt for receiving liquid passing through said pulp suspension on said belt, said treatment liquid supply means comprising a treatment liquid feed pipe for supplying a flow of said treatment liquid, distribution means for dividing said flow of treatment liquid from said treatment liquid supply means into first and second flow components, said first flow component being in said predetermined direction and said second flow component being counter to said predetermined direction, deflecting means for deflecting said second flow component into said predetermined direction, and application means comprising first and second plate members for applying said first and second flow components onto said pulp suspension, wherein each of said first and second plate members includes at least one gap for supply of at least a portion of said first and second flow components therethrough to control the amount of said treatment liquid supplied to said pulp suspension.