A separator apparatus for separating solids from a solids laden fluid, the separator apparatus comprising a screen apparatus (510, 521, 522, 523) arranged in a container (512), the screen apparatus (510, 521) comprising a box (510) and at least one screen (521, 522, 523) in or on the box (510), vibratory apparatus (516) for vibrating the at least one screen (521,522,523), the material to be treated flowable to the at least one screen (521, 522, 523) and fluid in the material flowable to and through the at least one screen (521, 522, 523), at least part of the container (512) disposed beneath the at least one screen (521, 522, 523), a means (130a) beneath the at least one screen (521, 522, 523) for removing solids from the container (512), the solids including liquid, characterised in that a vibrating member (541, 543, 542) is arranged adjacent the at least one screen (521, 522, 523) for inducing vibrations in said solids laden fluid in the vicinity of said at least one screen (521, 522, 523).