A nursery in a nearby town used large rocks that butt together and stick out
of the pond. This made a rock fence that keeps the koi out of that section.
Water is pumped in one end of the walled-off section and flows out the
other. The small openings around the rocks are plenty big enough to allow
outflow without allowing the koi to enter.

I thought this was a neat solution.

Mac Knight
http://www.macknight.addr.com

"John" wrote in message
m...
I have 14'x22'x3.5' pond (one month old with two koi, 10 gold fish),
now I need to setup a veggie filter but not more room outside of the
pond (concrete & walkway & patio), how do I seperate the pond into two
section?(one for plant one for fish) what material should I use to
prevent the fish get into the veggie filter?
Thanks in advance.
John