Due to the operating principle, the electrical conductivity of the liquid to be cleaned must be kept as low as possible to prevent a discharge between the electrodes. Only if there is almost no current flowing, it is possible to build up an electrostatic field. Water in the oil counteracts this requirement. For this reason, the oil which is treated in an electrostatic oil cleaning system must already be suitable for this process and contain less than 500 ppm water to keep the electrical resistance as high as possible.

Depending on the model, different amounts of oil can be kept clean per year. Whether one large oil tank or several small ones is irrelevant. Different control systems are available, which can be adapted to suit the application.