I built a veggie filter after reading about the benefits of water hyacinth.

I am correcting a pond and was debating different types of filtration. I have done bogs before but they are difficult to clean. This concept simply involves removing plants when mature as they provide both biological filtration as well as mechanical filtration.

http://www.solutionsforwater.org/solutions/the-application-of-water-hyacinth-in-wastewater-treatment-for-small-society

http://www.ehow.com/facts_5913918_water-hyacinth-sewage-treatment.html

http://www.creativelanddesignmd.com/html/veggie_filter.html