through conduit 31 and through the flared connector 23 whereupon the liquid is introduced into the interior of the beam 13 the liquid is then forced radially outward through the perforated beam 13 and into the layers of fabric f wound thereon and after soaking fabric f to depth is withdrawn out of the vessel 11 in such instance a portion of the liquid is passed upwardly through the flow rectifying panel 22 and through the upper perforated wall 11a into the first flow take out means namely jacket 24 thence into conduit 25 the remaining portion of the liquid is passed downwardly through the bottom perforated wall 11b and through the second flow take out means namely pipe 26 into common conduit 25 designated at 34 is an outlet valve for draining used treatment liquid it has now been found that uniform and efficient treatment of the material f can be achieved by regulating the flow rate of liquid through the second flow take out means 26 to be preferably in the range of one third 1 3 to four fifth 4 5 of the flow through the first flow take out means 24 as a practical expediency there is provided in the liquid passage of the flow take out pipe 26 a control valve 32 whereby the rate of withdrawal of liquid from the vessel can be controlled in the above preferred range referring now to fig2 4 inclusive there is shown another form of apparatus according to the invention which is basically the same as the apparatus shown in fig1 in so far as concerns the principles of the invention hence all parts of the.