Some time back I remember reading of an interesting filter application
for ponds. One component of this filter consisted of a tray(s) of
aquatic plants such as water hyacinth or water lettuce whose roots acted
as a biological filter media. If someone, with a mind less cluttered than
mine, could please send details of the construction of the filter. I
have a friend interested in adding something like this to his pond setup.
sperkins at admin4_hsc.uth.tmc.edu