After engineering the E. coli, it will be applied into the aquarium from the top of it. The engineered bacteria move with the water flow. It then sticks on the biofilm on the surfaces when AHL is detected. BREAC can degrade the biofilm and leave the surfaces. Following the water flow, it moves to the pipe which allows water inside to leave the tank. The magnet at the opening of the pipe attracts the used BREAC. Lastly, the magnet with used BREAC on it is removed.