Nelsen/Enpress CT-2010, 20 Micron to 10 Micron Pleated FilterThe Ennpress Orange Filtration Series features dual gradient double pleated filter models with 5, 10 and 20 micron filtration levels. By having a larger pre filtration layer on the outer layer and a smaller one internally, these filters are designed to effectively extend filtration level contamination and service life, while providing superior flow with minimal pressure drop. CT 2010 External 20 Micron Pleated pre filter, with 10 Micron Pleated