Credit: Louis Landesman (USA)
The inserted pictures show a small unit for duckweed production which is located near Hanoi, Vietnam. The unit consists of two small wading pools filled with drinking water and one scoop of biodigester slurry. The water in the two pools have been fertilized with lemna duckweed collected from a local village pond. The visit report tells that after four days, the mass duckweed were harvested and used to feed pigs and chickens living on site.