Wastewater, particularly black and gray water, produced in macerating human waste, is now treated to provide reduced total suspended solids. The wastewater includes a liquid media comprising salt-containing substance such as brine or seawater. The wastewater is electrolytically treated. In the treatment the electrolysis cell contains an anode that has a surface coating including tin dioxide. During electrolysis, the cell will produce hypochlorite while also reducing BOD and residual chlorine discharge.