ANSWER FIRST
Check the residue before adding equipment
White spotting after water dries can be consistent with mineral deposits. Detergent residue, existing damaged surfaces and cleaning products can also affect appearance. Document where the residue occurs and test hardness at an untreated outlet before deciding that a whole-home purchase is necessary.
Ion exchange targets dissolved hardness; a standard carbon cartridge does not. Salt-free conditioning should not be presented as hardness removal. Existing scale may require cleaning or appliance service even after the source of new deposits is addressed.
Three checks before the next step
- 01
Compare untreated and treated hardness
- 02
Inspect existing equipment before replacing it
- 03
Separate new-deposit prevention from surface cleaning
Compare the related treatment or service → · Try the educational decision check
Local evidence and its limits
The City 2026 report covers 2025 monitoring. SNWA regional guidance describes the broader water context; public-system results are not a measurement at your tap. Confirm your supplier and relevant property measurements. Sources reviewed 2026-10-18.
City report publication and monitoring period · SNWA home-treatment guidance