drop across the screen of the screen basket is typically about 5 psi the pressure washer reject flow to the outlet 62 is about 4 500 to 9 000 liters per minute containing about 2 5 to 5 bdmt d of sand and mud 33 and the pressure washer 38 64 flow to the accept outlet 52 is about 500 to 1 000 liters per minute and 7 5 to 15 bdmt d of pin chips in addition a certain amount of clean wash water 68 may be supplied to the supplemental water inlet 66 to increase the water flow with the pin chips if necessary for proper functioning of the pressure washer 64 it should be understood that the chip wash and recovery system 20 will not recover all fiber in the wood chip wash water but can be expected to recover the majority of such fiber particularly the fiber contained in pin chips of approximately 1 16 inch in diameter and in the neighborhood of a quarter inch long it should also be understood that the holes formed in the screen basket will have a diameter approximately that of the diameter of the pin chips however for optimal sizing it may be necessary to try screen holes of varying sizes to obtain the best recovery from a particular wash water stream it should be understood that the holes 44 are preferably circular but may deviate from circular so long as the holes easily pass.