Thanks, Jon.
So then I would actually need 2 pumps?
One to run the water from the pond to a
bog filter and another to take it from the
bog filter and pressurize it for the waterfall?

The pond is below ground level. The bog filter would
be sitting on the ground and be supplied by pump #1.
Then I need pump #2 from the bog filter,
through the closed system fluid bed filter up to
the waterfall, about 3' higher than the pond.

My waterfall is fed from a 1" tube manifold which is
hidden inside the waterfall. From the manifold are
(7) - 1/8" dia. tube lines to various outlets hidden within the
waterfall. I like to keep all the mechanical
components as hidden from view as possible.

Any ideas are appreciated. I do not want to add
more complexity than necessary. "In pond" filters
are a colossil pain I've dealt with for about 2 years
and would like to eliminate it altogether.

Mark

"jon" wrote in message
...
Yes the water entering a fluid bed filter has to go threw mechanical
filtration first to take out most of the solids.
But for a 500gallon pond its probebly a bit accesive you would be fine
with a bog standard filter from the water garden centre just go for one
that
says it will do up to a 1000 or a 1500 gallon pond and you should have no
problems with a filter larger than you actually need it will require far
less cleaning and you would be able to stock to a higher level. In my
first
pond (500g) I had for six years several koi 3 largest 18inch each and
dozens
of goldfish and with the filter being far bigger than actually required we
never had any problems.