Soil Aquifer Treatment is an artificial groundwater recharge method. Water is introduced into the groundwater under controlled conditions via soil percolation. Soil aquifer treatment is either used to artificially augment the groundwater level in order to withdraw freshwater at a later stage or as a barrier to prevent saltwater or contaminants from entering the aquifer. During percolation, soil filtration occurs and the water remains some time in the aquifer where mixing and may some other physical and chemical reaction occur, so it can be used as reclaimed water (treated blackwater) or relatively little polluted water (e.g. pre-treated greywater or stormwater).