Filtration can be used whenever there is a need to separate insoluble solid particles from a liquid or gas. It is applicable in situations where the components of a mixture differ significantly in particle size. For instance, it is used when brewing coffee to separate grounds from the liquid, when cleaning swimming pool water to remove debris, or when treating municipal water supplies to ensure safety. In laboratories, it is used to isolate precipitates from solutions after chemical reactions. In industry, it is employed to purify chemicals, recover catalysts, or treat wastewater before discharge. Filtration is not suitable for separating dissolved substances, such as salt in water, unless specialized membranes like those in reverse osmosis are used. It is most effective when the solid particles are large enough to be physically blocked by the filter medium. Therefore, filtration is the go-to method for clarifying fluids and recovering solid materials from suspensions.
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