I fixed the subject line for you ;-)

A veggie filter uses plant for filtration. How you go about
doing this changes from person to person.
Mine has plants without pots and no stones or gravel. It is
approximately 16' long and 4' wide and 2' deep. At the spot
where the water enters I have window screen to act as a
mechanical filter, then the plants and at the end I have
bioballs. For plants I have water celery, water hyacinth,
and water cress.


--
Bonnie
NJ
http://home.earthlink.net/~maebe43/