Mark T. wrote:
... 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.


Here is a page of homemade / DIY filters:
http://www.mikebentley.com/ponds/homemadefilters.htm

On that page there is a link to a DIY fluid bed filter for a pond; the
size of the pond seems to have been 500 gal (found a page referring to
"new pond").
http://homepage.ntlworld.com/gary.webster1/

HTH
--
zookeeper