through the passageway 10 the fluidizing means 24 will be moved reciprocally and the plurality of agitators 26 will cause rather severe motion in the fluid to prevent fibers from agglomerating and to prevent fibers from sticking to either of the screens 21 or 22 meanwhile wash water will be passed under pressure provided by pumps 17 and or 23 through the channels 14 and 15 arrangement of the apparatus is such that wash water can be directed as desired for the best cleaning by way of example wash water may be introduced at the inlet 16 at one end of the channel 14 the wash water may then be removed at the exit 20 of the channel 15 this arrangement will provide a counter flow of the two fluids for the maximum cleaning ability the process can be reversed or two separate streams of wash water can be established one in the channel 14 and one in the channel 15 it will be understood that the object of the invention is to cause the wash water to engage the slurry in the passageway 10 to pick up the various contaminants from the fibers and to remove the contaminants in the slurry looking now at fig2 of the drawings the construction is shown in more detail the channel 14 is shown as having.