An atomiser nozzle to be used on a tap for controlling a flow of water from the tap, the atomiser nozzle comprising a housing having an inlet, first and second internal chambers (18, 19), a first outlet and a second outlet, first and second flow paths from the inlet to the respective outlet (16a, 16b), and a flow-switching mechanism to direct the flow of water along either the first flow path or the second flow path, the first flow path directing the flow of water through the first internal chamber, a deflector (32, 120) disposed within the first internal chamber, and the first outlet, and the second flow path directing the flow of water through the second internal chamber, and the second outlet, thus allowing unrestricted laminar flow by bypassing the deflector (32, 120); and wherein the deflector (32, 120) is spaced from the first outlet to provide a sub-chamber within the first internal chamber located between the deflector (32, 120) and the first outlet characterized in that, the first internal chamber is domed at the first outlet end to accelerate the water towards the first outlet, at least one groove (126a, 126b) is provided in the sub-chamber for directing water to the first outlet, the groove imparting swirl to the water flowing towards the first outlet, such that in use, the first flow path yields an atomised flow of water so that the water emerges as tiny droplets rather than a coherent stream, thereby creating a mist or spray and thus saving water by limiting the rate at which the water may be dispensed from the tap and the second flow path yields a laminar flow of water thus allowing a convenient fast-flow of the water from the tap. a housing having an inlet, first and second internal chambers (18, 19), a first outlet and a second outlet, first and second flow paths from the inlet to the respective outlet (16a, 16b), and a flow-switching mechanism to direct the flow of water along either the first flow path or the second flow path, an inlet, first and second internal chambers (18, 19), a first outlet and a second outlet, first and second flow paths from the inlet to the respective outlet (16a, 16b), and a flow-switching mechanism to direct the flow of water along either the first flow path or the second flow path, the first flow path directing the flow of water through the first internal chamber, a deflector (32, 120) disposed within the first internal chamber, and the first outlet, and the second flow path directing the flow of water through the second internal chamber, and the second outlet, thus allowing unrestricted laminar flow by bypassing the deflector (32, 120); and the second internal chamber, and the second outlet, thus allowing unrestricted laminar flow by bypassing the deflector (32, 120); and wherein the deflector (32, 120) is spaced from the first outlet to provide a sub-chamber within the first internal chamber located between the deflector (32, 120) and the first outlet characterized in that, the first internal chamber is domed at the first outlet end to accelerate the water towards the first outlet, at least one groove (126a, 126b) is provided in the sub-chamber for directing water to the first outlet, the groove imparting swirl to the water flowing towards the first outlet, such that in use, the first flow path yields an atomised flow of water so that the water emerges as tiny droplets rather than a coherent stream, thereby creating a mist or spray and thus saving water by limiting the rate at which the water may be dispensed from the tap and the second flow path yields a laminar flow of water thus allowing a convenient fast-flow of the water from the tap.