An apparatus for processing biological material containing stringy tissue, the apparatus comprising: a container (454, 456) having an internal containment volume, the internal containment volume including a tissue retention volume and a filtrate volume; a filter disposed within the internal containment volume with the tissue retention volume on one side of the filter and the filtrate volume on another side of the filter with the tissue retention volume and with the filtrate volume being in fluid communication through the filter; an inlet port in fluid communication with the tissue retention volume and configured to access the tissue retention volume for introducing human biological material into the tissue retention volume; and a shaft including: a tissue collector attached to the shaft and disposed in the tissue retention volume and rotatable relative to the container in a direction of rotation about an axis of rotation, the tissue collector including multiple teeth positioned on the tissue collector; and one or more mixing propellers (470a, 470b) attached to the shaft and being configured to direct axial flow from the mixing propeller in a direction toward the tissue collector, wherein rotating the tissue collector disposed in the tissue retention volume relative to the container in a first direction of rotation about an axis of rotation to sweep the teeth positioned on the tissue collector through the biological material to collect stringy material on the tissue collector. a container (454, 456) having an internal containment volume, the internal containment volume including a tissue retention volume and a filtrate volume; a filter disposed within the internal containment volume with the tissue retention volume on one side of the filter and the filtrate volume on another side of the filter with the tissue retention volume and with the filtrate volume being in fluid communication through the filter; an inlet port in fluid communication with the tissue retention volume and configured to access the tissue retention volume for introducing human biological material into the tissue retention volume; and a shaft including: a tissue collector attached to the shaft and disposed in the tissue retention volume and rotatable relative to the container in a direction of rotation about an axis of rotation, the tissue collector including multiple teeth positioned on the tissue collector; and one or more mixing propellers (470a, 470b) attached to the shaft and being configured to direct axial flow from the mixing propeller in a direction toward the tissue collector, a tissue collector attached to the shaft and disposed in the tissue retention volume and rotatable relative to the container in a direction of rotation about an axis of rotation, the tissue collector including multiple teeth positioned on the tissue collector; and one or more mixing propellers (470a, 470b) attached to the shaft and being configured to direct axial flow from the mixing propeller in a direction toward the tissue collector, wherein rotating the tissue collector disposed in the tissue retention volume relative to the container in a first direction of rotation about an axis of rotation to sweep the teeth positioned on the tissue collector through the biological material to collect stringy material on the tissue collector.