An directional slow flow trough includes: a main body, the main body is surrounded by a first partition, a second partition and a baffle to form a receiving space, and the baffle is disposed on the first partition Between the second partition and the upper portion of the upper baffle, at least one water inlet hole is provided, the water inlet hole allows water outside the main body to flow into the accommodating space, and the water enters the inner side of the baffle a baffle is disposed at a corresponding position of the hole to guide water flowing in from the water inlet hole to flow downward along the flow guiding plate； and a filter core is disposed in the accommodating space, the filter core is tubular, and the pipe wall is There is a hole in the hole, and a filter outlet is arranged on one side of the first baffle. The axial end of the filter core is connected to the filter outlet, so that the tubular inner portion of the filter core communicates with the outside of the main body.一種定向緩流槽，包括：一主體，該主體由一第一隔板、一第二隔板與一導流隔板包圍而形成有一容納空間，該導流隔板設置於該第一隔板與該第二隔板之間，且該導流隔板上部其中一端設有至少一個入水孔，該入水孔可供該主體外的水流入該容納空間，且於該導流隔板內側該入水孔相對應位置設置有一擋板，以導引從該入水孔流入的水沿著該導流隔板往下方流動；以及一濾心，設置於該容納空間中，該濾心為管狀，管壁上有孔洞，且於該第一隔板一側有一過濾出口，該濾心的軸向一端連接該過濾出口，使該濾心的管狀內部與該主體外相通。
