here are some do it yourself filters on these websites

http://users.owt.com/jjspond/
http://www.fuerjefe.com
http://www.skippysstuff.com/

for koi richtoybox is right about depth, could you go longer also?
Koi need a lot of room


RichToyBox wrote:
Several others will give info on filter systems. I have a vortex, going to
a bead filter, going to an upflow gravel filter filled with plants. If you
are doing a koi pond, I would highly recommend going deeper, installing a
bottom drain, and a skimmer. 2 feet deep is pretty shallow for koi. My big
pond is about 3.5 feet deep, and some of the koi ponds that I have seen are
8 or more feet deep.


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John Rutz
Z5 New Mexico

never miss a good oportunity to shut up

see my pond at:

http://www.fuerjefe.com