The brushes, resembling paint rollers, are located on the front and back of the machine, and help to remove contaminating particles from the pool's floor, walls, and, in some designs, even the pool steps (depending on size and configuration).
The brushes integrated into the device play a crucial role in maintaining the pool's cleanliness by removing particles and debris from its floor, walls, and sometimes even the steps, depending on the machine's capabilities and design.