Rainwater treatment assembly comprising a cartridge container (20) with a container inlet and a container outlet, and comprising a substrate cartridge (30). The substrate cartridge (30) includes a substrate for treating rainwater and has at least one top entrance for being fluidly connected to the inlet, at least one side entrance for being fluidly connected to the inlet, and at least one exit for being fluidly connected to the outlet. The cartridge container (20) is configured to accommodate the substrate cartridge (30) and is dimensioned such that when the substrate cartridge (30) is accommodated, an inflow space (40) for receiving fluid is defined outside of the substrate cartridge (30), adjacent to the side entrance, and in fluid communication with the container inlet. The rainwater treatment assembly comprises a fluid guider (50) for directing at least a part of a fluid directly towards the top entrance of the substrate cartridge (30).
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