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What (who) is gravel bed filter - definition

SAND

Bacteria bed; Filter sand; Filter beds; Filter bed

filter bed

¦ noun a tank or pond containing a layer of sand or gravel, used for filtering large quantities of liquid.

Gravel cycling

CYCLING DISCIPLINE, MOSTLY ON GRAVEL ROADS AND GENERALLY LONG-DISTANCE

Gravel biking; User:DovaModaal/gravel cycling; Gravel grinder; Gravel racing; Gravel riding; Gravel grinding; Gravel bicycle racing

Gravel cycling, gravel biking or gravel grinding is a sport, or a leisure activity, in which participants ride bicycles mostly on gravel roads. Sometimes, specially designed gravel bikes are used; in other cases, any bicycle capable of covering the terrain can be used.

https://en.wikipedia.org/wiki/Gravel_cycling

Photographic filter

CAMERA ACCESSORY CONSISTING OF AN OPTICAL FILTER

Daylight filter; Filter (photography); Lens filter; Filter ring; Filter mount; Filter thread; Cross screen filter; Photographic filters; Red Black and White filter; Camera filter; Series filter

In photography and cinematography, a filter is a camera accessory consisting of an optical filter that can be inserted into the optical path. The filter can be of a square or oblong shape and mounted in a holder accessory, or, more commonly, a glass or plastic disk in a metal or plastic ring frame, which can be screwed into the front of or clipped onto the camera lens.

https://en.wikipedia.org/wiki/Photographic_filter

Wikipedia

Sand filter

Sand filters are used as a step in the water treatment process of water purification.

There are three main types; rapid (gravity) sand filters, upward flow sand filters and slow sand filters. All three methods are used extensively in the water industry throughout the world. The first two require the use of flocculant chemicals to work effectively while slow sand filters can produce very high quality water with pathogens removal from 90% to >99% (depending on the strains), taste and odour without the need for chemical aids. Sand filters can, apart from being used in water treatment plants, be used for water purification in singular households as they use materials which are available for most people.

https://en.wikipedia.org/wiki/Sand filter