An apparatus for stirring liquid with both high and low liquid levels in a vessel (1), including a turbine (20) which has a vertical shaft, is situated centrally at the bottom of the vessel (1) and is driven for rotation such as to drive the liquid radially outwards. An annular disc (30) co-axial with the turbine (20) is carried by the upper side of the turbine, with its inner edge portion resting on the radially outer parts of the turbine blades (21).
