WaterChef RCSF-7 Shower Filter Replacement Cartridge with Advanced ThermalGuard (for SF-7C Shower Filtration Systems) Powerful 2-Stage Filtration with ThermalGuard for Superior Chlorine Reduction Independently Tested & Certified by NSF International for Trusted Performance Low Cost per Shower - NSF Certified Capacity of 10,000 GALLONS per Cartridge Quick & Easy Cartridge Replacement (includes Cartridge Change Reminder Decal) Your Bodys Natural Oils & Proteins Remain Intact for Noticeably Softer Skin and Hair