#filter device that removes something from whatever passes through it
supertype: device an instrumentality invented for a particular purpose; "the device is small enough to wear on your wrist"; "a device intended to conserve water"
subtype: air_filter__airfilter__aircleaner removes dust from air that passes through it
subtype: filter_tip an air filter on the end of a cigarette; contains material that filters the smoke
subtype: bacteria_bed layer of sand or gravel used to expose sewage effluent to air and the action of microorganisms
subtype: coffee_filter filter (usually of paper) that passes the coffee and retains the coffee grounds
subtype: drain_basket__drainbasket a filter in a sink drain; traps debris but passes water
subtype: filter_bed filter consisting of a layer of sand or gravel for filtering water
subtype: fuel_filter a filter in the fuel line that screens out dirt and rust particles from the fuel
subtype: light_filter__lightfilter__diffusing_screen__diffusingscreen a transparent filter that reduces the light (or some wavelengths of the light) passing through it
subtype: oil_filter__oilfilter a filter that removes impurities from the oil used to lubricate an internal-combustion engine
subtype: strainer a filter to retain larger pieces while smaller pieces and liquids pass through
subtype: colander__cullender bowl-shaped strainer; used to wash or drain foods
subtype: sieve__screen a strainer for separating lumps from powdered material or grading particles
subtype: riddle a coarse sieve (as for gravel)
subtype: sifter a household sieve (as for flour)
subtype: tea-strainer__teastrainer a device to keep back tea leaves when pouring a cup of tea
subtype: water_filter__waterfilter a filter to remove impurities from the water supply
subtype: glass_wool__glasswool glass fibers spun and massed into bundles resembling wool
subtype: diatomaceous_earth__diatomite__kieselguhr a light soil consisting of siliceous diatom remains and often used as a filtering material
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