Aiming to improve the water quality improvement processes at the WWPT intervention site Borj Touil, Tunisia, according to the "fit for purpose" principle, a sedimentation tank has been built before the existing Constructed Wetlands aiming to avoid that the amounts of sludge that can flow from the existing storage basin upstream of the Constructed Wetlands could produce clogging in the filter beds. The post-treatment unit feed, by gravity, the existing Constructed Wetlands.

Through a pumping system, the TWW supplies the 4 ha included in the GDA of Sidi Amour and, by gravity, the farmers’ fields in Borj Touil (6 ha).