What you might be noticing
- Orange or red-brown staining
- Dark deposits on fixtures
- Recurring staining despite existing equipment
What to establish before buying
- What iron and manganese results are available?
- What other chemistry may affect the treatment method?
- Can the supply meet the cleaning requirements of the proposed filter?
A mistake worth avoiding
Do not assume the same filter is right for every staining problem, or that a softener will always replace dedicated treatment.