In Crete in 1700 BC, King Minos installs the first flushing device in a palace wash closet. The flushing-mechanical or not - is the thing. Ever since people could pour a vessel full of water on an accumulation of waste to move it along, they have been flushing. Gravity (if only by the lay of the land) and filters (if only reeds) are also as old as human ingenuity.
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