Most works are focus on the bank of the streams ... The plants are planted initially horizontally, then let the roots grow deep into the soil so that the plants can trap the impurities in the water , thus "clean-up" the water to some extent . Algaes are also put into the bank at first, then let them grow naturally, which will eat up P and N in the water.
Some much of the scientific terms ... take a look ba ...
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