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The pink colored film or ring frequently seen on showers, tubs, and toilets is typically caused by growth of the airborne bacteria Serratia marcesens. This harmless nuisance organism reacts with standing water and frequently forms during spring and summer months.
The best treatment for this film is to keep bathroom surfaces clean using chlorine bleach on a regular basis. A small amount of chlorine bleach (three to five tablespoons) added to a normal sized toilet bowl will destroy the bacteria. Whenever a pink film starts to reappear, repeat the cleaning and disinfection process.
Serratia does not survive and is not present in the chlorinated drinking water supply.
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