20" BB - Polypropylene Graded Density 10 mic

Features: High flow rates Superior dirt holding capacity Fewer change-outs for a longer service life Larger 4.5" diameter than standard 2.5" cartridges High-quality cartridge filter with high particulate retention capabilities over an extended life, all at an economical price. Thermally bonded - Manufactured through an exclusive process that thermally bonds 100% pure polypropylene microfibers with lower density at the outside surface and progressively higher density toward the center. Ideal replacement cartridge for many of the "in-line" (Big Blue®) filter housings on the market