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Updated the question to be more specific, after the first answer.

Can Aeschynomene aspera be used in constructed wetland for filtering grey water in Tropical Climate, especially in Eastern India (West Bengal)?

Aeschynomene aspera grows in watery area but I have not seen their mention in grey water filtration, possibly due to the the sparse documentation regarding this topic based on West Bengal, India geography.

Sarbbottam
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Possibly as it's an aquatic plant. However it's deemed a weed to rice growers. In constructed wetlands, best to plant what existed in the wetlands that lived in that region.

LazyReader
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