Hi Miriam,  I visited a site ...

Hi Miriam,  I visited a site in East London area. They have a self fashioned septic bio filter system. It was working very well and is an excellent model for villages and homesteads. The system takes all the effluent from the toilets and uses plant based chambers to metabolize the  black water.  Similar to John Todd's living machines.  I was just in Amsterdam with John last week.

Contact me for site contact information.

Another system is similar to the John Todd strategy based living machines. These are all over the world combining dry compost toilets and water purifying chambers for the grey water. There is no black water in this system.  The best system I've seen is in Alaska. 

Sanitation in Africa begins at the source and delivery system. The facilities built into the houses needs to change as does the current cultural practices. Models exist and are simple.

Always available to talk.

Daniel Halsey