Abstract: A method of magnetically treating drinking water for domestic livestock comprises the steps of: mechanically filtering the water to effect removal of ferromagnetic particles; causing the water to pass through a magnetic field of alternating polarity of an intensity between 600 and 6500 gauses and of a field gradient of between 0.2 and 6.0 kgauss/cm, whereby the flow is laminar at a velocity of between 0.5 and 2.4 m/s.; recirculating water not consumed by the animals by pumping it again through the magnetic field, while choosing the distance between the points of alternating polarity and the water velocity in such a manner that each water particle experiences not less than 2 and not more than 60 polarity changes per second.