The invention relates to a device (100) for the filtration of rainwater or wastewater, intended to be positioned so as to allow the flow of said water therein, the device (100) comprising: - a main body ( 10) extending along a main direction of elongation and comprising an inlet port (101) and an outlet port (102); - A filtration block (20), arranged inside the main body (10). It is essentially characterized in that: - the equivalent diameter of the outlet orifice (102) is less than the equivalent diameter of the inlet orifice (101), - the filtration unit (20) comprises at least one layer of aggregates.
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