2020N-30 Racor Cartridge Fuel Filter Elements with Genuine Aquabloc Media for 1000 Turbine Series Housings Racor Turbine Series Fuel Filter/Water Separator systems remove water and dirt from diesel fuel systems. They have exceptional bulk and emulsified water removal efficiency, low restriction to fuel flow, and high dirt-holding capacity for long life. The heart of the system is the filter cartridge made with Aquabloc media. Aquabloc is a patented blend of high-grade cellulose compounded with engineered fibers and chemical treatments proven to block water. Racor 2020N-30 Cartridge Elements features 30-micron particle removal efficiency, rated 98% efficient at 30 microns. The lower the micron rating, the finer the filtration. Ultimately, the micron rating preferred will be a function of fuel quality, operating climate and maintenance schedule.