The NuvoH2O MHP-42516 is a high-performance replacement cartridge for the "Manor" system salt-free water softener. It contains a proprietary, FDA-approved, citrus-based agent that activates the scientific process of chelation, effectively lowering the PH level of water and binding with metal ions that cause hard water (mainly calcium and magnesium). This process prevents damaging and corrosive scale deposits from forming and removes existing scale to protect and extend the life of your water heater, plumbing fixtures, and water-utilizing appliances. With naturally-conditioned water produced by the NuvoH2O system, your laundry will be brighter and softer, you will use less soap, lotions, and conditioners, your hair and skin will be healthier, and you won't get that slimy feeling on your skin after bathing that comes with salt-based water softeners. Be sure to replace the cartridge every 6 months so that you can continually enjoy the benefits of softer water in a healthy, convenient, cost-effective, eco-friendly way.