That is, when blood is caused to flow by means of a pump through the filter unit having a fiber bulk density of from 0.02 to 0.40 gram/cubic centimeter and an average fiber diameter of from 3 to 10 microns or caused to flow by means of {TAIL ~ instillation} through the filter unit having a bulk density of from 0.04 to 0.15 gram/cubic centimeter and an average fiber diameter of from 5 to 10 microns, {HEAD ~ the erythrocytes} contained in the resulting erythrocyterich suspensions exhibit little or no morphological or biochemical change 
That is , when blood is caused to flow by means of a pump through the filter unit having a fiber bulk density of from 0.02 to 0.40 gram / cubic centimeter and an average fiber diameter of from 3 to 10 microns or caused to flow by means of { TAIL ~ instillation } through the filter unit having a bulk density of from 0.04 to 0.15 gram / cubic centimeter and an average fiber diameter of from 5 to 10 microns , { HEAD ~ the erythrocytes } contained in the resulting erythrocyterich suspensions exhibit little or no morphological or biochemical change
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