This invention makes the most of amplitude space of watercourse bottomland or wasteland, construct composite surface flow swamp system that takes surface current swamp as main and combine with terminal vertical current leaking swamp, to precede cleaning treatment to the watercourse or polluted water. This invention has merits of low cost, no need electric power, purifying effect good and so on, can reach the end of water quality purification as well as ameliorate ecological environment of dry beach, wasteland and so on.
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