• Manufacturer: Watts• Actual Filter Size: 2-1/2" x 20"• Micron Rated: 50 Micron• Core/Center Tube: PP• Temperature Rated: 140°FWatts SF50-20 Poly Wound PP replacement filter cartridgesWatts Poly Wound (aka: String Wound) Filter Cartridges can be used to remove dirt, rust, sand, sediment and silt from your water. Specifications of the SF50-978• Manufacturer: Watts • Actual Filter Size: 2-1/2" x 20" • Micron Rated: 50 Micron • Core/Center Tube: PP • Temperature Rated: 140°F Standard Features of PP Wound filters• Polypropylene fibers for purity and chemical compatibility • Meets FDA requirements for food & beverage contact • Standard cartridges rated for temperatures to140°F ( Up to to 200°F with SS Cores ) • Packaged in poly-bags for cleanliness • Filter used to remove dirt, rust, sand, sediment and silt from your water • These filters are recommended to be changed every 6 to 12 months, or sooner, depending on water quality, usage or application. • Manufactured from 100% pure polypropylene fibers Watts-StringWound.pdf