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Water resources, particularly the phreatic ones, are exposed to a high risk of nitrates pollution. This pollution appears mostly in rural areas, due to improper use of fertilizers, improper waste storage or local sources of infestation, like animal sheds, and so on. Recent researches have indicated that clay can be used for groundwater decontamination. Mass transport between the unsaturated and saturated zones greatly influences subsurface processes. The transition zone between the vadose zone and the saturated zo...