Culligan CW-F water filter's string-wound design reduces fine sediment from a variety of fluids. The Culligan CW-F water filter life is up to 3 months or 12,000 gallons. The Culligan CW-F 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. Culligan CW-F sediment filter cartridges are very economical and wound in a standard pattern around the core. Culligan CW-F water filters are suitable for a wide variety of sediment filtration applications, including municipal and well water as well as many industrial fluids. 01019132 Culligan CWF filter fits in housings for 10 inch water filters.