A showerhead combination includes a first showerhead that is non-handheld; a second showerhead that is handheld; and a control device that includes a switching mechanism and a magnetic control unit that is movably installed within the first showerhead to control when water flows out of the first showerhead. The second showerhead cooperates with the first showerhead so that, when the second showerhead is connected to the first showerhead, the connection drives the control device to cause water to flow out from the first showerhead, and, when the second showerhead is disconnected from the first showerhead, the control device causes the first showerhead to stop the water flow. A method for controlling water flow includes connecting the second showerhead to the first showerhead to cause water to flow from the first showerhead; and disconnecting the second showerhead from the first showerhead to cause water to stop water from flowing therefrom.