The present invention relates to a method for identifying a data area D,E or D,G, reserved in accordance with a first specification, as useful data area G in accordance with a second specification. Each node determines whether to replace the beacon node. In order to reduce the electromagnetic interference the common mode current is reduced by reducing the voltage driving a current through the high parasitic capacitance. The enclosure may be formed of UV-transparent material to allow for UV treatment of fluid passing though the filter assembly. Next, code may be produced, based on the received user selectable elements, configured to implement the process.