Nuvo H2O HHP-2516 Home Water Softener High Performance Replacement Cartridge The NuvoH2O Home Softener System uses a revolutionary technology to lower the pH level of water based on the basic scientific process of chelation. The resulting water is soft and healthy for all of your household uses, including drinking, bathing, washing, and lawn and plant watering. This Cartridge will NOT fit the Nuvo Manor System or the Nuvo Studio System FDA & NSF approved / For homes with 1  2 residents Cartridge Lifespan: about 20,000 gallons Prevents scale build-up and removes existing hard water scale  C ontains: 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