The Pentek CW-50 Polypropylene Wound Water Filter Cartridges are designed to reduce fine sediment from a variety of fluids. This filter cartridge withstands temperatures up to 165° F. These water 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. These filter cartridges are very economical and wound in a standard pattern around the core and are suitable for a wide variety of sediment filtration applications, including municipal and well water as well as many industrial fluids. NOTE: Do not use with water that is microbiologically unsafe or of unknown quality without adequate disinfection before or after the system.