Rather than removing beneficial minerals like old-fashioned salt softeners, the NuvoH2O system uses a citrus-based formula, called CitraCharge, to bind hard minerals. Once bound to CitraCharge the minerals cannot form scale. It can even extend the life of costly water heaters. There's no change in your water's taste either. The Home system is designed for homes with less than 1,500 sq. ft. Cartridge replacement is recommended every 6 months.