Nuvo H2O M-42416 Manor Water Softener Replacement Cartridge The NuvoH2O Manor Softener System uses a revolutionary technology to lower the pH level of water based on the basic scientific process of chelation. Cartridge Lifespan: about 50,000 gallons For home with 4 or more residents or over 2,000 sq ft. This cartridge will NOT fit the Nuvo Home System or the Nuvo Studio System Please review images to make sure you are purchasing the correct cartridge for your system Prevents scale build-up and removes existing hard water and scale. Contains: no salt, no waste water, no electricity Compact design  fits almost anywhere Extends the life of your water heater, plumbing fixtures and appliances Developed from 25+ years of commercial experience FDA &amp; NSF approved