I would recommend you ...

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I would recommend you research about BACF (bioreactor activated carbon filter). Its also depend on how quality of waste water after treatment.

Have ever heard about one step filter. I also attached link for your reference.

https://www.witteveenbos.com/projects/improved-water-treatment-1-stepr-filter/

For more information, you can reach me at email: tan.truong@witteveenbos.com.