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ViroCap filter. Arrows indicate fluid flow. Sample enters through inlet (a). Liquid outside filter cartridge is at relatively high level (b). Liquid passes through filter cartridge to relatively low level inside (c). Metal insert prevents air from entering liquid exiting filter cartridge (d). Liquid passes up filter cartridge by vacuum (e). Liquid exits through the top outlet (Fagnant et al. 2017b) (f)
