"RichToyBox" wrote in message
news:qmhXa.41805$cF.15683@rwcrnsc53...
BV,

Your VF is a combination bio-mechanical and veggie filter. The roots on
the
plants act as strainers for the mechanical filtration, and they also act
as
surfaces, along with the liner, any submerged rocks, etc. as a place for
the
bacteria of the biological filtration. Then they also remove the
nutrients
created by the bio filter. A nice large filter needs little cleaning, but
you do have plans to vacuum out the veggie filter once or twice a year,
don't you? It is a matter of size.
snip

Shhh...Don't ruin my fun.

BV.