Water lilies, such as these which abound in Paoay Lake in Ilocos Norte, are pleasing to the eye. And yet they sometimes choke the river ecosystems, owing to their ability to reproduce quickly. They are known for their ability to thrive even in highly polluted rives like the Pasig, and because of this they are sometimes used for wastewater treatment.
BY ACE ALEGRE
Contributed to Bulatlat
Vol. VIII, No. 16, May 25-31, 2008
