Someone wrote this up, can't remember who, probably a group effort but here is
an explanation of a veggie filter
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Construct a veggie filter - an area,
10% to 20%, of the size of your pond surface area. A couple of inches deeper
than the plant baskets (the rigid black mesh baskets made specifically for
water plants) you are going to use to plant in. Plant the baskets with marginal
plants with fine gravel. Pump the pond water through at a turnover rate per
hour 1/2 to 1/4 of the pond volume. Veggie filter uses up many of the nutrients
and provides a good place for bacteria to grow. Build it with a bottom drain
(or two) for ease of cleaning - very important, this helps with backups and
leaking over the edge.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


k30a