the arrangement concerns an improved design for at least one of the cooling dilution and washing at the bottom of a continuous digester for the production of cellulose pulp by arranging at least one extra strainer section above the lowermost strainer section with the addition of washing fluid or dilution fluid between the extra strainer section and the lowermost strainer section more washing fluid can be added at the bottom of the digester without counteracting the flow of the column of chips this provides space for the increase of production for improvement of the flow of the column of chips or for combinations of these effects while retaining good cooling washing and dilution at the bottom of the digester application_number US 32692208 A description fig2 shows a first embodiment of the invention where the bottom design comprises an arrangement for the addition and withdrawal of fluids to a digester that is used for the continuous cooking of cellulose pulp wood chips are continuously fed through an inlet at the top of the digester not shown in the drawing and cooked cellulose pulp is continuously output through an outlet 10 at the bottom of the digester at least one strainer section 2 is arranged in the digester in association with the bottom of the digester with strainer surfaces 22 c or similarly 22 a 22 b in fig1 arranged in the strainer.