About 85% of American homes have hard water, and most homeowners only learn what that means when scale kills a water heater or spots ruin every glass. Water softeners ($800–$3,000 installed) are the standard fix; whole-house filtration handles taste, odor and contaminants. This section explains how to test your water, which system fits which problem, what installation really costs, and the maintenance nobody mentions in the sales brochure.
Softener vs filter: different problems
Softeners remove hardness minerals (calcium, magnesium) via ion exchange. Filters remove chlorine, sediment, lead or other contaminants. Many homes need one or the other — some need both. Testing first ($20 kit or free municipal report) prevents buying the wrong system.
The salt question
Salt-based softeners remain the most effective for genuinely hard water. Salt-free "conditioners" do not remove hardness — they claim to reduce scale adhesion, with mixed evidence. Our guides separate marketing from chemistry.