6. External links
- Water Quality Association • The international trade group that represents the water industry, WQA provides easy-to-understand information about a range of issues.
- Arizona Water Quality Association • Rrepresents the point-of-use, point-of-entry water treatment industry in the state of Arizona.
- Find a local certified water treatment professional • (Note: Those also holding WSSP-A certification can be found here).
- Find certified water treatment products
- CASS study on salinity and other solids in water • A summary and the official findings.
- HDR report on water softening • (2.6 MB)