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Natural treatment of sewage wastewater has an environmental and economic means. It is applied by infiltrating wastewater through the vadose zone (unsaturated zone) of an aquifer. This method of treatment proved its effectiveness in removing or reducing most of harmful substances through physic-chemical and biological analysis. The obtained results validated that most of toxic substances were removed by percent of 99.1%, 97.6%, 94.7%, 98.6%, 100%, 99.9% and 100% for TSS, BOD, COD, NH 3 , PO 4 ,doi:10.23953/cloud.ijaese.269 fatcat:urygheykcjgpbc7kbtsc3mxmfq