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Picture a large submerged filter chamber that is gravity fed and the same level as the pond. Like the side chambers on many of the ponds shown in Koi-Bito.
Now rather than using a jump filter or bead filter you just push water out a very large TPR or set of TPRs. Keep the head pressure low (less than 2 feet) and a pump like the ones Luke has been looking at should do very nicely.
I think he should have a skimmer circuit that terminates in a wet/dry shower-style filter as well. But the drain circuit is just all about moving water around for settlement and bio.
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