FLOWMETER SYSTEM USEABLE WITH WATER TREATMENT DEVICE

1. A meter system for a water treatment device, the device having an inlet aperture, an outlet aperture and a channel for channeling water between the inlet and outlet apertures, the meter system comprising: a flow reactive device positioned in the channel and exposed to the flowing water, signal generating member positioned on the flow reactive device causing said flow reactive device to produce a spatially varying signal in reaction to water flow; a sensor coupled to the flow reactive device, and being sensitive to the proximity of the spatially varying signal of the flow reactive device, the sensor generating a flow signal corresponding to water flow in the channel; an output device for indicating when the water treatment device is usable; and a controller coupled to receive and accumulate the flow signal, and including a first threshold representing a delay function during water flow, and a second threshold representing a termination of use, said controller comparing the accumulated flow signal to the first threshold, the controller not actuating the output device when the accumulated flow signal is below the first threshold, the output device thus indicating the delay function, and the controller activating the output device when the accumulated flow signal exceeds the first threshold and is below the second threshold. 2. A meter system as defined in claim 1, wherein the first threshold corresponds to a total volume of water passed through said channel. 3. A meter system as defined in claim 1, wherein the flow reactive device is a turbine rotatable about an axis and having a plurality of blades. 4. A meter system as defined in claim 1, wherein the signal generating member is a magnet. 5. A meter system as defined in claim 1, wherein: the flow reactive device is a turbine rotatable about an axis, and having a plurality of blades equally spaced about the turbine, each blade having a distal end; a magnetic member positioned in the distal end of one of blades and at least one blade opposite the blade comprising a magnetic member contains a counterweight. 6. A meter system as defined in claim 1, wherein the switch is a reed switch. 7. A meter system as defined in claim 1, wherein the switch is a Hall-effect sensor. 8. A meter as defined in claim 3, wherein said switch is unexposed to the flowing water. 9. A meter system as defined in claim 1, wherein said second threshold represents a period of time. 10. A meter system as defined in claim 1, wherein said s