Stains

Color of Stain Possible Cause Treatment Options
White, gray Calcium hardness Water softening
Alkalinity Deionization, de-alkalizers
Total Dissolved Solids Reverse Osmosis
Rust, orange, yellow Iron Iron filter
Corrosion iron pipes Corrosion control, acid neutralizer
Black, brown Manganese Greensand filter, chlorination followed by filtration
Iron bacteria Chlorination or ozone, followed by filtration
Hydrogen sulfide Chlorination or ozone, followed by filtration
Tannins, humic acid Tannin filter, chlorination followed by filtration
Blue, green Corrosion copper pipes Corrosion control, acid neutralizer
Pink Airborne bacteria Clean sinks, fixtures (not a water quality issue)

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  • Clean Water Systems & Stores, Inc., Water Treatment Equipment,Service & Supplies, Santa Cruz, CA