Fig. 1From: What evidence exists related to soil retention of phosphorus from on-site wastewater treatment systems in boreal and temperate climate zones? A systematic map protocolSchematic illustration of the system of interest. The phosphorus discharged from a soil-based on-site wastewater treatment system will reach surface waters in due time. However, chemical, physical and biological processes along the flow path contribute to delay the transport through the ground. These retention mechanisms may reduce the unwanted impact on surface waterBack to article page