What Causes Pink Stains On Toilets and Bathtubs?

If you’re seeing pink stains on the inside of your toilet, bathtub or shower, it’s usually not a problem with water quality, instead it’s likely the result of airborne bacteria that finds a home on moist surfaces. The film is usually found as a ring that accumulates at the water line in the toilet bowl or on shower doors, sink drains and bathtubs.

The bacteria that causes these pink stains is Serratia Marcescens, which is found naturally in the environment. The airborne bacteria thrives on moisture, dust, and phosphates. The best way to eliminate the bacteria is to use a bleach-based toilet bowl cleaner. Occasionally flushing toilets that are not used very often can also help reduce the bacteria growth.

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