The pink film commonly found in toilets is called Serratia marcescens.
Serratia marcescens is naturally occurring in the environment and can be found in a variety of places. It is commonly found in soil, water, air and even on plants. Because of its ability to thrive in moist conditions, it often appears in bathrooms, especially in places where water accumulates, like toilets, sinks, and showers.
Serratia marcescens feeds on the phosphates and fatty substances found in soaps, shampoos, and even the mineral deposits in water. Regular cleaning and disinfecting of the bathroom can help prevent the appearance of this film.
-AI