Abstract: A waste water separator device comprising a container having a base, the device also comprising an inlet with an exit therefrom and an outet with an entrance thereto and defined within the container first, second and third chambers through which waste water flows along a path between the inlet and the outlet, communication between the first and second chambers being by way of at least one aperture, in a wall separating the first chamber from the second chamber, close to the base of the container, and communication between the second and third chambers being either over the top of or through an aperture in a wall separating the second chamber from the third chamber at a height above the entrance to the outlet.