| Skimmers will devour food like mad just so you know and remove bugs from the top the koi enjoy and keeps them closer to the surface in general hangout hours per week.
However, if you want a really cheap option, at Home Depot in the plumbing section next to the pvc aisle are some drainage boxes that are made of plastic that will work well. They have 4" PVC or 3" outlets right on them. You can either set it in sideways with the drain on the bottom or set it in upright and cut a notch out of the side in the water. If you set it in upright you can easily fabricate a screen out of nylon mesh with a small 1/2" pvc frame and wedge it in at an angle to catch leaves, sticks, and larger debris. A liner should glue right to it very easily. Some marine grade silicone will also do the trick, and i am sure someone will next recommend Don Brazen's.
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