Koi pond filter

[kels]

I am trying to find a nice gravity feed filter for my cousins pond its about 3,000 gallon pond and want to be able to take a heavy bio load.

Thanks

 

[AWL9]

Its a hard question without knowing much about the pond size shape
If money is not an option Bottom drain to gravity fed Cetus sieve to Nexus 210 will cope. But what do you class as a heavy Bio load.
If not there are plenty of cheaper diy filters that can be made.
You can never have to much filtration.

 

[Muske]

What kind of filtration is currently running?

A skippy is an easy DIY to add.