ThisFiltration chapter provides an overview of aviation fuel filtration systems. Filtration systems are designed primarily to remove particulate contamination from fuel products as they are transported from refinery fuel tanks, ultimately to aircraft. Filtration systems also strip dispersed and free water from fuels. EI maintains EI 1550, handbook on equipment used for the maintenance and delivery of clean aviation fuel. The handbook includes all published and approved technology and provides additional details that are not covered in this chapter. This chapter will describe different types of filtration equipment, filter media, and the most common problems that can degrade filter performance.