Really depends more on your tubing/pipe size and filter. Too small diameter
pipe and it won't matter how big the pump is, because only so much water
can be pushed thru a certain size opening.

That said, get a pump that will drive water thru your filter at least one
turn around per hour, 1300 pond = 1300 gph exiting and entering. ~ jan

See my ponds and filter design:
http://users.owt.com/jjspond/

~Keep 'em Wet!~
Tri-Cities WA Zone 7a
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On 5 Jan 2004 22:03:03 -0800, (Han Chung) wrote:
For a 1300 gallon pond with 4 full sized koi, how powerful a pump will
I need to get for filtration purposes? Thanks, Han.