The Pipetector applies technology of nuclear magnetic resonance, while magnetic devices apply that of magneto hydrodynamic.

Magnetic devices require more than 2.0 meters/sec of flow speed to provide with anti-corrosion effect.This is unrealistic as the maximum speed limit of water flow is below that in general. Even if water flew faster than 2.0 meters/sec, water clusters that were broken up to smaller by magnetic devices will be back to normal state less than a second, so the devices cannot cover pipework completely.