Cooled water within power stations is applied to reduce the temperature of various systems that produce heat as waste, and others that warm due to the contact with steam. Water also needs to be of mild temperature before it is released back into the water source.
Due to the cycling of water throughout the plant, it picks up debris that can build up on the inside of pipes and potentially damage machinery. Also, the lower temperatures expose the water to environments where bacteria and microorganisms can grow.
Stages of filtration throughout this cycle consist of particle filters to reduce the concentration of suspended solids at a certain rated size. Ultraviolet sterilisation is also commonly implemented to cooling loops to kill and inhibit future growth of biofilm that can negatively affect the efficiency and shorten the service life of systems the water is used in.