Want to have a water softner installed to deal with very hard water and to generally improve its overall quality. Have been quoted approx $500 for a General Electric unit plus approx $600 for its installation, and $2,900, installed, for an Ecowater System unit, and a like amount for a Culligan unit, installed. Can someone share with me their knowledge to tell me why the large price difference? Care to recommend a brand? Thanks for all help.