Color of StainPossible CauseTreatment Options
White, grayCalcium hardnessWater softening
AlkalinityDeionization, de-alkalizers
Total Dissolved SolidsReverse Osmosis
Rust, orange, yellowIronIron filter
Corrosion iron pipesCorrosion control, acid neutralizer
Black, brownManganeseGreensand filter, chlorination followed by filtration
Iron bacteriaChlorination or ozone, followed by filtration
Hydrogen sulfideChlorination or ozone, followed by filtration
Tannins, humic acidTannin filter, chlorination followed by filtration
Blue, greenCorrosion copper pipesCorrosion control, acid neutralizer
PinkAirborne bacteriaClean sinks, fixtures (not a water quality issue)
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