Water hyacinth has an absorption me

Water hyacinth has an absorption mechanism for metals which provides a natural way of reducing metal content in water; however, as it will be reported elsewhere, water hyacinth also enhances the unwanted mosquito proliferation and reduces water volume by transpiration effect, screens the water from sunlight and drastically reduces the oxygen concentration; therefore water hyacinth is controlled by means of pesticides, producing an additional problem: water hyacinths die and fall down to the bottom of the reservoir, incorporating its
  metal content again to the reservoir Rodrıguez ´
. et al., 1998 .