In the Mekong delta people have the habit of using toilets built over the rivers or ponds. Anh Dương organizes in the villages and schools a session to watch excrement under a microscope in order to see germs, microbes and worms’ eggs. Anh Dương gives medicine to eliminate worms’ eggs. This action encourages the household to build proper latrines. Anh Dương rewards poor families who build a latrine with 500 000 đ and 200 000 đ for any other household. Since 2005, Anh Dương helped to build over 1400 latrines.