Mr. Evan ,   i think that ...

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Mr. Evan , 

 i think that you should try to treat the water by passing the water on a film of a Seaweed mounted on cement base then the water influent treat it by activated carbon to adsorpe any unwanted taste 

in that way you are going to elimenat all Nitrogen and phosphate from water beside the COD and BOD are going to be decrease 

Best regards 

Hasan Akil