Patent ID: 7082952

Claim:
A sewage well-cleaning system comprising: a rotary spray device rotatably mounted on a support arm in a sewage well and connectable to a cleaning liquid supply by a selectively operable liquid control valve; a liquid waste pump in the well; and control system including: a first waste liquid level sensor in the well detecting when waste liquid has been pumped from the well by the liquid waste pump; a control unit, operably connected to the cleaning liquid control valve; and a first timer and a second timer operably connected to the control unit; so arranged that when the first waste liquid level sensor detects that waste liquid has been pumped from the well by the pump, the control unit operates the cleaning liquid control valve, to allow cleaning liquid to flow to the rotary spray device to clean the well, with a wash cycle having a duration determined by the second timer, the first timer preventing the control unit from initiating a further wash cycle until the elapse of a preset period.