Eductor (10) for mixing a first liquid and a second liquid (17), the eductor (10) comprising: an air gap (103); a supply nozzle (87) upstream of the air gap (103); a flow guide (47) downstream of the air gap (103), the first liquid being in a current flow in a downstream direction; a tube (51) in the stream, the flow guide (47) being annular about the tube (51), and the tube (51) and the flow guide (47) being in a spaced telescopic relationship, including the guide of flow (47) a portion (107) that forms an angle towards an inlet portion of the tube (51); in which: the current is a main current (201); the tube (51) is arranged to, in use, divide the main stream (201) into a primary current (179) and a secondary current (181); and the tube (51) and the flow guide (47) define an annular space (171) not obstructed between them, substantially avoiding the annular space (171) that the air passes through when the secondary current (181) fills the space void (171).
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