Marketing InformationPentair PentekĀ® BFS and BBFS basic filtration systems consist of either two or three filter housings, which are mounted in series, a wall-mounting bracket and hardware. The BFS-201 features two 3/8 in NPT low-profile slim line housings in series for installations where space is limited. The BBFS systems consist of a series of large capacity 1 in NPT #20 Big Blue housings allowing for greater cartridge capacities and higher flow rates. All systems are equipped with a pressure relief button to relieve housing pressure during cartridge changes and are shipped completely pre-assembled, saving valuable installation time. All filter housings are manufactured of a durable polypropylene, have excellent chemical-resistance and are ideal for many residential, commercial and industrial applications.