So here is my set up.
I have some buckets of water sitting in a somewhat shady area. Each bucket has a mesh bag with grass clippings and a piece of apple, along with a rock to weight it down.
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I have another bucket with a lid that I cut a hole in.
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This lid holds a large brine shrimp net in place.
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Then I pour the contents of one of the buckets through the net.
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And rinse the net in a bucket of clean fresh water.
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After this, I use a turkey baster to sort out the wrigglers (and sometimes bloodworms).
The end result is this.
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Plenty for my fish to eat and I froze the leftovers.