
Biofilm is a thin slimy layer that readily forms on the inner surfaces of pipes. It is a safe habitat for bacteria, including Legionella, to live and breed.
Biofilm is the biggest bacterial breeding ground in water systems.
The diagram to the right shows how biofilm develops on the inner surfaces of pipes.
Biofilm develops where the temperature is right for growth and where there is a nutrient source. Nutrients can be scale, sediment, corrosion products and trapped organic and inorganic molecules supplied by the flowing water.
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