Hello, I am not super active here, so I rarely see any mentions. But I can definitely confirm that my pond with bog filter is chugging along just fine.
I ended up with a pond in the shape of a circle, 16ft diameter. Aproximately 40% of the surface of this circle is bog. 2 feet deep, 2" PVC manifold. 4-6" rocks on the bottom, graded up to pea gravel on top.
Calculated size: 1600gal
pump: 3000gph
Ducks: 5 domestic, and several more wild.
Some notes: The pond water stays perfectly clear, but the duck shit solids settle on the bottom, so if you disturb the water on the bottom, it clouds up. This has lead me to put the pump in a small cell off to the side made of cinder blocks. it keep the birds from shitting directly on top of the pump.
It's been rocking for 2 years now, and it's pretty fun. Ducks eat any plants I try to plant in the pond proper, so I am stuck with whatever grasses/reeds/rushes the ducks don't munch on in the bog. Oh well.