497064 - Operation, Maintenance And Monitoring Of The Eel Tylisos, Rodias, Krossona, Fodele, Keramoutsiou, Kavrochorio, Kaless, The Pumping Stations-Septanks A. Pelagia, Made, Lygaria, Fodele And The Pump Stations Of Monis, Krusona And Agias Pelagia Beach, With The Criteria For Awarding The Most Advantageous Offer From A Financial Point Of View, Based Only On The Price.