This article presents the results of experimental studies of suckling improvement of secondary clarifier of aeration station in Almaty. According to the research found, the work of secondary clarifiers evaluated for removal of suspended solids, concentration of returned sludge and sediment moisture. Technical specifications of aerations, secondary settling tanks and cesspool emptier in aeration station of Almaty were defined. Also It was shown that the use of the articulated sucker with movable scrapers can increase the efficiency of cleaning the bottom of the circular tanks. In this practical test proposed suckling radial settler in aeration station of Almaty during the year showed that sucker reduces costs for installation and maintenance cesspool emptier and has no damaging effects on the bottom of the sump.