Pink or Reddish Slime or Stain

A pink or reddish slime or stain comes from an airborne bacterium, Serratia marcescens that is found naturally in soil, food and animals. The bacterium produces a red pigment as it grows and multiplies. The bacterium thrives on moisture, therefore it will grow on moist surfaces such as toilet bowls, showerheads, and even pet water bowls. Because the bacterium is found in soil, customers who live near construction sites may frequently notice this pink slime or stain. It is harmless to humans and pets, but it can be a nuisance.

If you have a carbon filter, the bacteria growth will intensify because while chlorine will kill the bacteria, the carbon filter removes chlorine from water.

Treatment:

Keep the affected area clean and wipe the surface with chlorine bleach.