I have an integrated setup where the duck pen, duck pond, koi pond are connected. All are pond lined. Total volume of the whole setup is ~2000g. Water from each flows to a below grade sump and an external 3000gph pumps water back to each separately via a spaghettis nest of valves and pvc pipe. The sump houses a 2’x 2’ x 3” coarse and fine filter media for mechanical filtration. Biological filtration is handled by the Duck ponds vegetable filter and the Koi ponds vegetable stream.
Duck pen with a self replenishing water bucket. Excess flows back to sump. Pen is flooded daily to export duck poop.
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Duck pond is ~250-300g. Pond Filter is pea gravel and plants. Water is forced up the pea gravel via a series of perforated pvc pipes.
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Koi pond. ~1200g. Water from the koi pond passes through the stream and flows to the duck pond. The stream has become a jungle of water parsley which the ducks love to eat. Fortunately it grows so fast it’s almost impossible for them to devour it all.
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The sump also contains a settling chamber for the ducks pen and duck pond. 90% of the duck poo ends up here for export into the garden. ~250-300g
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