my koi pond and veggie filter http://users.megapathdsl.net/~solo/ponds/8-2003.html
pond and veggie filter construction
it is about 90 gallons and my pond is about 1400? gallons.
dont use lava rocks. shallow veggie filters work fantastic. use some course filter
material for the large stuff, the plants will take care of the rest.
use water flow that gives you a pleasant waterfall. pond water should exit from the
middle of the depth of the pond, that way catastrophic leaks wont leave your fish
high and dry. return should give nice waterfall, remember that the higher the pump
has to pump, the less water the pump can pump.
rather than a set area per gallon of pond I find using enough to keep the nitrates at
zero is fine.
a typical waterfall does not provide enough oxygenation .. add some extra aeration.
Ingrid

"Dave Hahn" wrote:
I need some information on what a 'veggie filter' should be. Some say that
the surface area should be 10 - 20% of your pond. Others say that it should
be 10 - 20% of the pond volume. Which is correct.
Also some say not to use lava rocks, others say it's okay.
What about water flow? How many gph should it have?
Should the pond water enter from the top or the bottom?


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