A fluidic oscillator adapted for use in a showerhead or nozzle assembly includes an eddy filter structure which reduces the adverse effects of fluid supply turbulence on the fluidic oscillator's spraying performance. A nozzle or rain can style showerhead assembly includes a water chamber or manifold which receives water via a central inlet fitting. Water entering the water chamber or manifold flows turbulently into and through the manifold and is expelled under pressure through a plurality of nozzles which are configured as specially adapted fluidic inserts.