A filter system for filtering fluids has a housing, an inlet, and an outlet. An object, representing the control application and having a first sensitive area, is displayed within the graphical user interface. According to the present invention, there is provided a method of initiating a handover by a femto base station by fining user equipments located in a cell coverage of the femto base station. Group A and group B intervals are paired and assigned to watermark bits. The flexible member 23 is reversed by means of pressurization by the pressurizing mechanism 30 so that the flexible member 23 enters the first storage chamber 21, thereby reducing the volume of the fluid storage unit 20 storing the fluid. The circuitry substrate is engaged with a tester substrate.