The drawing I did was actually a rework of the initial design for my own koi pond, before I decided to take a risk on installing a rather expensive rotary drum filter in place of the sieves.
The only differences between the design I posted, and the original one for my pond is that I had two sieves running in parallel for increased flow capacity (30-40 tons per hour) and a somewhat larger settlement chamber. I also had a skimmer feeding the settlement chamber in addition to the bottom drain.
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