Modern fuel filter cartridges made in ECO technology are designed considering easy utilization after exploitation period. Due to this fact these cartridges are manufactured without metal parts, while bottoms and cores are made of modern plastic resistant to fuel. Lack of metal parts in ECO cartridges allows utilization of used cartridges in incinerator plants without dismantling and selecting elements. These cartridges do not have outer casings made of perforated paper (as in traditional models) because filtering media are made of modern filtration materials with higher rigidity and pleats separation provides overpress on side surfaces of pleats during the process of filtering media pleating.