Abstract: A device treats liquids such as water by mechanical vibration. This vibration reaches a useful frequency by the harmonics of the primary vibration, for the destruction or inhibition of microbiological organisms contained in the water. This primary vibration is obtained by the passage of the liquid through a helix that carries the liquid, which in turn impacts and displaces a plurality of rods or elongated elastic bodies in order to obtain a mechanical vibration. This vibration is preferably controlled by the action of the electrical capacitance between the vibrating rods and the helix vanes that conduct the liquid, for which purpose the rods are connected to a pulsating electric energy source. This primary vibration is also controlled by the action of a permanent magnetic field produced by semi conducting media arrayed on a central tubular support of the helix, in such a way that the harmonics of the vibration that affect the incompressible liquid are transmitted to the biological contents of the liquid.