Ion exchange water filters, e. g. Waterboss and WaterMax softeners, work well for water softening. Waterboss filter series completely remove hardness salts, iron and manganese from water. Moreover, WaterMax filters remove chlorine, nitrates, and high-molecular organic compounds, that's why they cost more.
Waterboss and WaterMax softeners are designed to treat salt water from both shallow and artesian wells.
See the catalogue of softeners.