The pink substance you are seeing in your water tank is most likely Serratia marcescens, a type of bacteria, not algae.
Understanding the Pink Stuff
While often mistaken for algae or mold, the pink or reddish film that appears in water tanks, shower stalls, toilet bowls, and other damp areas is commonly caused by bacteria known as Serratia marcescens.
According to the reference, a red or pink pigmented bacteria known as Serratia marcescens is thought to be the cause of pink stuff. These bacteria produce a distinctive red pigment called prodigiosin, which gives the colonies their characteristic pink to reddish color, especially when exposed to light and moisture.
Where Does it Come From?
Serratia bacteria are common inhabitants of our environment. They can be found in many places, including:
- Human and animal feces
- Dust
- Soil
- Surface water
This means the bacteria can easily enter your water system or tank through various means, such as airborne particles, contaminated water sources, or even carried on hands or surfaces.
Why Does it Grow in Water Tanks?
Serratia marcescens thrives in moist environments where it can access nutrients. Water tanks, especially those that are not frequently cleaned or are exposed to environmental contaminants, provide an ideal breeding ground for these bacteria. The presence of soap residue, mineral deposits, or other organic matter can also contribute to their growth.
How to Deal with Pink Bacteria
Finding Serratia marcescens in your water tank requires cleaning and disinfection. While generally considered less harmful than some other bacteria, particularly for healthy individuals, it's important to address its presence.
Here are general steps often recommended:
- Empty the Tank: Completely drain the water from the tank.
- Clean the Surfaces: Scrub the interior surfaces of the tank thoroughly to remove the visible pink film.
- Disinfect: Use a disinfectant solution, such as a diluted bleach solution (ensure it's safe for your specific tank material and follow manufacturer guidelines), to kill remaining bacteria.
- Rinse: Rinse the tank multiple times with clean water to remove the disinfectant residue.
- Refill: Refill the tank with fresh water.
- Regular Maintenance: Implement a regular cleaning and maintenance schedule for your water tank to prevent future bacterial growth.
It's also beneficial to identify and address potential sources of the bacteria entering your system, such as ensuring clean water sources or addressing dust issues near vents.
