The trough (100) has a standard comprising a bin (200) defined by a base wall, and a rotary unit i.e. rotary body (300), rotatably mounted along the base wall to mix materials in the bin. A control unit is reversed in a periodic and automatic way. The control unit includes a timer. The rotary unit includes a shaft (310). Blades (320) are mounted around the shaft. The bin comprises side walls. A motor (M) is fixed inside a pot integrated to the side walls of the bin. An independent claim is also included for a process for mixing materials in a bin.
