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Chemistry, engineering and materials

  • Filter (aquarium), critical components of both freshwater and marine aquaria

  • Filter (chemistry), a device (usually a membrane or layer) that is designed to physically block certain objects or substances while letting others through

  • Filter paper, a semi-permeable paper barrier placed perpendicular to a liquid or air flow. It is used to separate fine solids from liquids or air

  • Air filter, a device composed of fibrous materials which removes solid particulates such as dust, pollen, mold, and bacteria from the air

  • Oil filter, a filter to remove contaminants from engine oil, transmission oil, lubricating oil, or hydraulic oil

  • Pneumatic filter, a device which removes contaminants from a compressed air stream

  • Water filter, removes impurities from water by means of a fine physical barrier, a chemical process or a biological process. Filters cleanse water to various extents for irrigation, drinking water, aquariums, and pools

  • Sieve or macroscopic filter