Confirm the problem
Check that hardness is the concern
Hard water tends to show itself as scale on faucets, showerheads and other fixtures, soap residue, and soap or detergent that seems to work less well. Those signs point toward hardness minerals. Taste, odor or a specific contaminant is a different question that a softener is not designed to answer.
A hardness result for your own supply, from your water provider or a test at the home, tells you more than a general figure for the region. If the City of Phoenix supplies your water, its annual water quality reports include a section on hardness. Bring any results you have to the conversation.
