Due to the operating principle, the electrical conductivity of the liquid to be cleaned must be kept as low as possible to prevent a breakdown between the electrodes. Only if there is almost no current flowing, it is possible to build up an electrostatic field. Water in oil counteracts this requirement. Some oil systems have a constant water ingress into the oil, either due to the process or the environment. Before this oil can be treated with the electrostatic operating principle, as much water as possible must be removed from the oil. To achieve this, the 1E models are equipped with an oil dewatering filter upstream of the electrostatic unit. This allows free water to be removed from the oil so that it complies with the parameters for the treatment of electrostatic oil cleaning.

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.