Water Spots and Staining

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Water spots are common problems with water from sustainable water sources. Here’s a list of common water stains and how to treat them.

Color of Stain	Possible Cause	Treatment Options
White, gray water spots	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)