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The sewerage of the Athens Metropolitan Area is carried out with a network of primary and secondary wastewater pipes, which collect and transport wastewater to the sea area of ​​Psyttalia after their biological treatment at the Wastewater Treatment Center of Psyttalia.

The sewerage network of the Basin is separate except the center of Athens - from Galatsi to Plaka - where the network is pantorroic (length 88 km) in some parts. Most of the sewage network operates by gravity, as the geomorphology of the soil allows this operation.

For the areas that are low, ie for the areas that extend on the coastal front of the Saronic Gulf, 51 pumping stations are used. The pumping stations operate with automatic electric pumps, while their operation is controlled through a Remote Control - Remote Control System.

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