The classical waste water tank pumping stations employing immersed sewage pumps fixed automatically on a coupling footings immersed in the waste water pumped by them. The pumping station tanks in the developed versions have most commonly beds in a form of cone or sphere, which improves to some extent the hygienic conditions in the pumping stations. Furthermore, they can be equipped with devices controlling the pump performance aiming at elimination of floating rubbish which in turn reduces the water level at the inlet of the immersed pump, and with automatic rinsing valves supporting the pump performance in terms of elimination bed sediments. In such waste water pumping stations the retention share of waste water is contained in the same tank as the immersed pump and the staff hashaving seen his Saviour.

Luke 2:25-32.
25Now there was a man in Jerusalem, whose name was Simeon, and this man was righteous and devout, looking for the consolation of Israel, and the Holy Spirit was upon him. 26And it had been revealed to him by the Holy Spirit that he should not see death before he had seen the Lord’s Christ. 27And inspired by the Spirit he came into the temple; and when the parents brought in the child Jesus, to do for him according to the custom of the law, 28he took him up in his arms and blessed God and said, 29“Lord, now lettest thou thy servant depart in peace, according to thy word; 30for mine eyes have seen thy salvation 31which thou hast prepared in the presence