I saw this photo when I was working on my pond earlier this year. In principle, my current pond design is similar but half of the pond is underground and the rest above ground was built with concrete and landscaping blocks. I about 2000 gallons. There is a Laguna MaxFlo pump supplying the waste water to the bottom of the bog and the water travels up to the spill ways on top. However before getting into the pond, I have a canister filter to separate out the large debris. Real happy with the design and effectiveness so far, pond is super clear and water quality is pretty much spot on. As others have mentioned, get the right substrate in the filter, as pool filter media were not intended to clear out crude like you find in a pond.