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Filter (Chemistry)In chemistry and common usage, a filter is device (usually a membrane or layer) that is designed to block certain objects or substances whilst letting others through. Filters are often used to remove harmful substances from air or water, for example to remove air pollution, to make water drinkable, to prepare coffee. In domestic food and drink preparation where bulk solids are removed from liquids, this is often called a strainer. Filtrate is the liquid produced after filtering a suspension of a solid in a liquid. See also Filters for various substances: Filters for specific applications: Filters by various methods: Related devices and concepts:
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