A chromatographic module (17), comprising a fluid inlet (14) to the module, a fluid outlet (11) from the module and a chromatographic packed bed (32) positioned within the module between the fluid inlet (14) and the fluid outlet (11). The packed bed (32) is retained within the module by a first fluid porous frit (38) located at the side of the fluid inlet (14) and a second porous frit (40) located at the side of the fluid outlet (11), and a portion of the fluid inlet (14) and a portion of the fluid outlet (11) are in fluid communication with the respective frits (38,40) and the packed bed (32). A chromatographic apparatus comprises at least one, preferably several, of these chromatographic module(s) (17).
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