Say goodbye to hard water. nuvoH2o is a better way to soften water the eco-friendly way without electricity. And you’ll never buy salt again. nuvoH2o uses citrus, not salt. It’s called CitraCharge Cell Technology, and will provide you with month after month of clean, fresh and great-tasting water. Buy direct and save. Already have a nuvoH2o system? Replacement cartridges are also available.