Water hyacinth works great in the top of a veggie filter.
You don't have to "put" them in anything,
thay just float and send down long masses
of roots.
You can see photos of my 100gallon rubbermaid
stock tank veggie filter here,
http://www.radioheaven.homestead.com/Cement_Pond1.html
Ron
--
Ron Lawrence, kc4yoy
(Curmudgeon in training)
POBox 3015
Matthews, NC 28106-3015
704-289-1166 (home)
kc4yoy(at)carolina.rr.com
Radio Collection Web Page,
http://www.radioheaven.homestead.com