| Blue and green water stains
Blue or green stains are a sign of copper: It may have entered your water supply; or, you might have copper pipes that are being corroded. Start by having your water tested for copper; also, check its pH, total dissolved solids content, and oxygen content.
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| Red water stains
Most red stains are a result of iron in the water. However, there are many types of iron, each calling for different methods of removal. A test will reveal what sort of iron problem your water has, so you can seek the appropriate treatment.
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