The filter catridges in the fuel filters ZOLLEX purify the fuel supplied to the injection system as much as possible. The fuel filters are mainly composed of a mixture of cellulose and polyester fibre treated with duroplasts impregnation which increases fuel resistance. The filtering materials have multilayer structure composed of composite materials which increase its ability to absorb the harmful particles for more than 100% in comparison with other filtering elements. The novelty of the trade mark ZOLLEX is a coarse mesh filter with magnet. The know-how of this element is the following: the metal particles in the fuel are hold by the magnet.