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air filter

Environment; Filter

An air filter is a device composed of fibrous materials which removes solid particulates such as dust, pollen, mold, and bacteria from the air. A chemical air filter consists of an absorbent or ...

A filter is a device (usually a membrane) that is designed to physically block certain objects or substances while letting others through. Filters are often used to remove solid substances suspended ...

water filter

Environment; Filter

A water filter removes impurities from water by means of a fine physical barrier, a chemical process or a biological process. Filters clean water to various extents for irrigation, drinking water, ...

biofilter

Environment; Filter

Biofiltration is a pollution control technique using living material to capture and biologically degrade process pollutants. Common uses include processing waste water, capturing harmful chemicals or ...

salt meadow

Environment; Filter

A meadow subject to overflow by salt water.

diesel engine

Environment; Filter

A type of internal combustion engine that uses low-volatility petroleum fuel and fuel injectors and initiates combustion using compression ignition (as opposed to spark ignition that is used with ...