Fluid meter with bioactive substance

The present invention relates to a fluid meter, in particular water meter (1) with a connecting housing (2) for installation in a fluid supply network, located one in the connection housing (2) inlet (3), located one in the connection housing (2), outlet (4), one in the connector housing (2) located measuring section (5), an ultrasonic transducer assembly (6, 7) for generating and receiving ultrasonic signals that pass through the measuring section (5) and by means of which the flow rate can be determined, as well as an electronic module (8), within is provided with a coming into contact with the fluid bioactive substance of the terminal housing (2) a reservoir.