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 water heaters. Cartridge replacement is recommended every 6 months. Complete System replacement filter and softener cartridge. This dual system provides the homeowner with a whole home carbon filter for better tasting & smelling water and a water softener cartridge to protect your home from the effects of hard water. Features Easy installation- our cartridges can be replaced by simply unscrewing the canisters from the head Replacing the old cartridge with the new one Eco friendly- no wasted water no electricity and no drain needed for this system Effective- the complete system is effective at removing contaminants in the water for better tasting & better smelling waterSpecifications Weight: 17 lbs - SKU: NVRSD1006