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Bacterial Slimes, commonly referred to as biofilms, are gelatinous mats that resist the flow of water in distribution lines and through heat exchangers/condenser tubes. 

Biofilms are produced by microorganisms and consist of a sticky rigid structure of polysaccharides and other organic contaminants. This slime layer is anchored firmly to a surface and provides a protective environment in which microorganisms grow. Biofilms generally form on any surface that is exposed to non-sterile water or other liquids and is consequently found in many environmental, industrial and medical systems.

The growth of bacterial slimes can significantly increase the energy requirements of the cooling water recirculation pumps.