One aspect of the disclosure relates to a filtration unit intended to allow the removal of leukocytes from a fluid such as blood or a blood component, the unit containing a porous element including a medium for the removal of leukocytes by adsorption and filtration of the leukocytes. The disclosure also relates to a bag-based system including such a unit, said system being in particular arranged for the sterile and closed-circuit filtration of the fluid.
