Additional Details ------------------------------ Product description: The Omnipure (ELF XL ALL UXC-8SF) Resin Cartridge, also known as the QWS Water Softening Cartridge, is a cation exchange softening cartridge which reduces hardness and scale deposits. Attaches to any permanent ELF-Series Head. The Omnipure (ELF XL ALL UXC-8SF) contains FDA grade softener resin. Rating: 10 Micron Rating Maximum Pressure: 125 PSI Maximum Temperature: 100 F Filtration Media: UXC-8SF Softening Resin Removes Hard Water Minerals