A method 1 wherein said leukocyte containing suspension is caused to flow, by means of {HEAD ~ instillation}, through the container having packed therein said mass of fibers having a bulk density of from 0.04 to {TAIL ~ 0.15 gram/cubic centimeter} and an average fiber diameter of from 5 to 10 microns, whereby a substantial part of the leukocytes is entrapped in said mass of fibers and a leukocyte poor liquid is obtained 
A method 1 wherein said leukocyte containing suspension is caused to flow , by means of { HEAD ~ instillation } , through the container having packed therein said mass of fibers having a bulk density of from 0.04 to { TAIL ~ 0.15 gram / cubic centimeter } and an average fiber diameter of from 5 to 10 microns , whereby a substantial part of the leukocytes is entrapped in said mass of fibers and a leukocyte poor liquid is obtained
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