The idea of a big work, that would sufficiently resolve in the long run the problem of water supply of Thessaloniki by transporting water from the river Aliakmon, was initially conceived in the decade of 1970. The planning of the work took form with the studies of the years 1975-1977, however only specific individual departments were manufactured at that stage. During the years 1992-1997 the planning was updated in relation to the land-planning development of the region and was modernized regarding the specified water treatment process. In addition, the pipe of potable water was extended towards the eastern region.
The work begins from the place Barbares (Aliakmon Dam), roughly 40 kilometres before the estuaries of the river. Flowing by gravity in a 50 kilometres linking canal, water is transported up to Axios River. It then passes Axios River via a 1,5 kilometres long Axios siphon, flowing to the pump room of Sindos, through an 8,5 kilometres closed conduit. From there, it is pumped up to the installations of water treatment (Refineries), in a 4,7 kilometres pressurized pipe. A complex process of extensive cleaning follows in the refineries, including precipitation, sand beds, active coal filters, ozonization, chlorination etc, ensuring high quality of water. The clean potable water leads to a reservoir of a capacity of 75.000 cubic metres, from where it is distributed, via conductors of a total length of 36 kilometres, in the existing water supply reservoirs, which are located in Diavata, Eyosmos, Polixni, Neapoli, Vlatades, Toympa and Kalamaria, serving the city networks.