Hello The septic tank has septic only the name is actually a storage tank. As proof, the stores the excrement that becomes feces mud. When the tank is full it must be emptied and people are looking for all means not to financially resolve this drain using wild drain: street rainwater, ditch, hole in the ground. Organic sanitation with its biotechnology eliminates all excrements, more draining and especially people water their garden with the liquid at the end of treatment