The NuvoH2O® line of softeners are whole home salt free water softeners that utilizes a proprietary citrus formula, CitraCharge®, to bind hard water minerals and reduce pH, rendering hard minerals incapable of forming scale. Unlike salt-based softeners, NuvoH2O® not only prevents hard water build-up, it also removes existing scale. Replacement of the cartridge is recommend every 4-5 months or 50,000 gallons. Simply remove the existing cartridge in the system and replace it with a new one. Simple - Effective - Compact - ConvenientThird party tested & verified - Proven to prevent and remove hard water scale build up.Eco-friendly - no wasted water, no electricity, no salt being released into the environmentEasy to maintain - No more heavy salt bags. Simply replace with our light weight cartridge.No Slick FeelingProtects and extends the life of your pipes, appliances and fixtures - promotes healthy, soft skin and hair