What are HEPA filters primarily used for in water works?

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HEPA filters, or High-Efficiency Particulate Air filters, are designed to trap very small particles, making them extremely effective at capturing airborne contaminants, including asbestos fibers. In the context of water works, HEPA filters are typically employed in situations where the air quality must be protected from hazardous materials, such as during maintenance or construction activities that might disturb asbestos-containing materials. Their design allows them to filter out particles as small as 0.3 microns with high efficiency, ensuring that potentially dangerous fibers do not compromise air safety for workers or the surrounding environment.

Other options pertain to different contaminants that require specific removal methods. Chlorine removal typically involves chemical treatment rather than filtration, while microbial contamination is usually handled through disinfection processes such as chlorination or UV treatment. Heavy metals require different filtration methods, often involving activated carbon or specialized ion exchange systems to effectively remove them from water.

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