We have a design for drainage pipe made from a mix of concrete and activated charcoal.  It works, it's simple, it may also "filter out" some microconstituents and other pollutants.  Though it's simple and robust it's not been generally accepted.

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We have a design for drainage pipe made from a mix of concrete and activated charcoal.  It works, it's simple, it may also "filter out" some microconstituents and other pollutants.  Though it's simple and robust it's not been generally accepted.