Abstract: The invention relates to an apparatus (1, 1?) for filtering a fluid, in particular a Bernoulli filtering apparatus (1, 1?), comprising: a housing (3, 3?), a plurality of filter elements (55), arranged in the housing (3, 3?), for filtering the fluid, an inlet (5) for admitting fluid to be filtered into the housing (3, 3?), and an outlet (7) for discharging the filtered fluid from the housing (3, 3?). The invention solves the stated problem by providing the housing (3, 3?) with a plurality of housing segments (23) which can be connected to adjacent housing segments (23), and by a filter element (55) being arranged at least partially inside each housing segment (23), and by the housing segments (23) and filter elements (55) together forming a modularly assembled filter module (9).