3.2.3 Water filtration unit
The new design of filter unit receives wastewater and filter by sand, followed by gravel and biochar. The biochar will absorb colors and supply fresh water. Efficiency of such filter arrangements have already been established in water supply systems. The impurities such as chlorinated chemicals are effectively removed by the biochar is revealed by the data in Table.1. Chlorinated organics which form methenogensis are adsorbed bthe biochar, hence fresh water in the sump will contain at the most nitrogen. In such waters fish will survive and prosper.