Hi, and thanks for all the good data!
It seems it's like the wild west as far
as filter systems go. Anything goes.
That's what makes it fun, I think.
I've searched around and seem some info. on
fluid bed filters, and it appears that you can
use them as a primary filter for ponds up to
2,000 Gal., U.S. I just have a 500 gal. pond.
But, I'd sure hate to spend the time building
the thing and still have to go and build another
multi tier filter. Does anyone have any direct
experience with the fluid bed filters? Like I stated
in a previous part of this thread, I need to pressurize it
due to having to force water through a multi-ported
manifold for my waterfall.

Thanks,
Mark