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If you are building the pond for koi and are relying on external pressure type filters (and not a bog), I would strongly suggest a bottom drain. Solid waste will collect on the bottom, but it really should be removed from the water column quickly and not allowed collect and decompose in the water. Also not a big fan of pressure filters, though I have used them on small water garden ponds without koi. If you are not doing a bog, there are a number of DIY gravity flow filters that you can build cheaply that will provide far better bio filtration than most pressure fitters. Shower, trickle, moving bed and static barrel filters are all relatively easy to build, cheap, and require little to no maintenance if constructed right. Most pressure filters provide only mechanical filtration with minimal bio filtration.
Do you know of any thread or video regarding installing a bottom drain by any chance?