The USFilter/Ametek/Pentek WP1BB20P water filter string-wound design reduces fine sediment from a variety of fluids. USFilter/Ametek/Pentek WP1BB20P water filter cartridges are suitable for a wide variety of sediment filtration applications including municipal and well water as well as many industrial fluids. USFilter/Ametek/Pentek WP1BB20P water filter cartridges are wound in a precise pattern around the core providing greater surface area. The result is higher dirt-loading capacity and greater efficiency than standard wound cartridges. USFilter/Ametek/Pentek WP1BB20P sediment filter cartridges are manufactured from a durable polypropylene cord that is wound around a rigid polypropylene core. They are an economical solution to reduce fine sediment including sand silt rust and scale particles. NOTE: Do not use with water that is microbiologically unsafe or of unknown quality without adequate disinfection before or after the system. NOTE: An antistatic agent has been used in the processing of the fibrous polypropylene and may cause some foaming in the liquid being filtered. Nominal 1 micron WP1BB20P Polypropylene String-Wound Water Filter Cartridge.