FILTRATION TESTING DEVICES

A filter unit (20, 320, 420, 820, 1020) is provided that includes a filtration chamber (30, 330, 430, 830, 1030) and a filter assembly (32, 132, 232, 432, 532, 632, 732, 832, 1032). A filter cartridge (28, 128, 328, 428, 528, 728, 828, 1028) of the filter assembly (32, 132, 232, 432, 532, 632, 732, 832, 1032) includes a support shell (44, 144, 344, 444, 744, 844) and a filter (60, 860) coupled to a support-shell side wall (50, 350, 850) so as to cover support-shell side openings (52, 352, 852). A handle (62, 162, 262, 362, 662, 762, 862, 1062) of the filter assembly (32, 132, 232, 432, 532, 632, 732, 832, 1032) is coupled to a proximal end of the support shell (44, 144, 344, 444, 744, 844). The filter assembly (32, 132, 232, 432, 532, 632, 732, 832, 1032) is partially insertable into the filtration chamber (30, 330, 430, 830, 1030), such that the filter assembly (32, 132, 232, 432, 532, 632, 732, 832, 1032) passes through a filter-assembly opening (40, 840) of the filtration chamber (30, 330, 430, 830, 1030); the handle (62, 162, 262, 362, 662, 762, 862, 1062) is disposed outside the filtration chamber (30, 330, 430, 830, 1030); and the filter cartridge (28, 128, 328, 428, 528, 728, 828, 1028) is disposed within the filtration chamber (30, 330, 430, 830, 1030). The filter (60, 860) is configured to filter biological particulate from a liquid specimen sample (22) when the liquid specimen sample (22) is driven along a fluid flow path (68, 868) while the filter cartridge (28, 128, 328, 428, 528, 728, 828, 1028) is disposed within the filtration chamber (30, 330, 430, 830, 1030). Other embodiments are also described.