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Currently, the pollution of water environment in Mekong Delta - Viet Nam is an urgent case. The pollution of river is becoming more and more popular. This is due to reasons: intensive cultivation, overusing pesticide in agricultural activities including breeding and fishing. To solve this problem, Ludwigia adscendens (Jussiaea repens L.) and Water hyacinth (Eichhoria crassipes) are the most popular aquatic plants which widely flourish in Sa Dec city - Mekong river. They can absorb organic and inorganic compounds in wastewater through their bio-filter system. The using aquatic plants for...