Hi Judy.
Along with all the other good advice you're receiving here,
please remember that your pump needs to cycle the
entire volume of water (in your case, about 3150 Gals.),
every hour. So you'd need a 3000 GPH pump, minimum.
If you're pumping up to your biofilter or up to a waterfall,
that needs to be considered as well. A filter outside of the
pond is indeed very much easier to maintain, while leaving
the pump itself in the pond is quieter. Once you decide
if you will have a waterfall, or how high you're going to pump
the water before returning it to the pond, lots of folks here
can help you figure out the "head loss".
I have a link to a site which provides several designs of biofilters
you can easily and inexpensively build yourself if you've a mind to.
Sometimes though, it's easier just to buy one and get it over with.

Hope this helps,
Mark

"Nedra" wrote in message
rthlink.net...
John is absolutely correct on this. For a bought filter -
Never take the manufacturers word for number of gallons
filtered. Especially so if you have or intend to get Koi.

I bought a Pond Filtration 3000 more than 6 years ago
for $325. My pond is about 3000... so I thought I was set.
I had 5 or 6 juvenile Koi and 5 juvenile Gold Fish. As the
fish grew so did my appetite for Butterfly Koi. I bought only
2 - an Orange one and an Orange and Black one. Everything
started going haywire three years ago. The Koi grew like
gangbusters.... I added a veggie filter - then I noticed Koi
babies in the pond. I now have 13 Koi and several Large
Gold Fish with quiet a few smaller goldfish. This is how your
filtration will grow - it has to keep up with the fish population.
;-)

Good Luck ..

Nedra
http://www.geocities.com/Heartland/Pines/4836
http://community.webshots.com/user/nedra118

"John Rutz" wrote in message
...


Judy wrote:
Hi John, thanks for replying, do you have any suggestions on brands
and types of biosystem for outside the pond? Some thing not too
complicated since I am a novice at plumbing. Thanks Judy


not realy I havent used a comercial filter in years been building my
own
but can tell you this if your pond fer instance is 1200 galons look
for a filter that is advertised for 3000 gal in other words at least
twice the size of your pond if not 3x
manufacturers seem to over rate thier filters in my opinion by a factor
of 2 for goldfish and by 4 for Koi







John Rutz
Z5 New Mexico

never miss a good oportunity to shut up

see my pond at:

http://www.fuerjefe.com