Hi Luke,
From what I have seen these pumps rock! In the application I saw, the bottom drain(s) were fed directly into a sump pit where the pump was located, and 6" - 4" pipe was connected directly to the pump up to the top of the bakki shower. This was not the only filtration in the ponds, this system was complemented by a chamber full of aerated Japanese matting where a FOK style pump would return the water to the pond. TPRs were handled by the traditional sequence type pump.
Here are a couple teaser videos............
Video 1 Video 2
Any of our friends from Malaysia want to add anything?????