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You dont need gravity to create suction you can use a pump.

Most people have a pond that's a few hundred gallons and half a dozen ducks. Which requires huge filtration. Its not unreasonable to have a 300 gallon pond and 3 55 gallon drums (165 gallon) filter. Obviously your situation is different (i think).

I would put a swirl filter as the first stage of your filter, and enough flow to turn over you volume 10 times an hour is standard. Might be able to get away with less if you only have a few ducks.