I agree with Mr. ...

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I agree with Mr. Goonetilleke. I am assuming you want to find out how well these wetland work. Can I suggest you read a very interesting study "Performance of a natural wetland treatment system for wastewater management, by Knight, McKim and Kohl, published by WPCF journal, Volume 59 Number 8 pages 746 and other publications including the US EPA. Good luck