A simple gULP installation
This is probably the quickest and simplest way to install a Koi pond filtration system.
In essence what we have done here is to pump from the settlement chamber, through two Happy Koi Brush Pre Filters and into a gULP moving bed bio filter. From there the water gravity returns back to the pond. The only tricky bit to this installation is to install an overflow into the gULP and to choke back the returns such that the overflow just starts to trickle water back to either the pond (best) or the settlement chamber.
In a few thousand words...