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2. Hydroponics - Wikipedia

   en.wikipedia.org/wiki/Hydroponics

   The same type that is used in aquariums, though any small gravel can be used, provided it is washed first. Indeed, plants growing in a typical traditional gravel filter bed, with water circulated using electric powerhead pumps, are in effect being grown using gravel hydroponics, also termed "nutriculture".

3. Substrate (aquarium) - Wikipedia

   en.wikipedia.org/wiki/Substrate_(aquarium)

   For freshwater aquaria, gravel is the most common substrate. To prevent damage to fish, gravel should not be sharp. Aquarium gravel can be as coarse as pea-sized or as fine as 1–2 mm. [1] It is available in a number of colors, and may be naturally colored or dyed, and may have a polymer seal to ensure it does not affect water chemistry. [1]

4. Aquarium filter - Wikipedia

   en.wikipedia.org/wiki/Aquarium_filter

   Some filter materials, such as plastic "bioballs", are best used for biological filtration. With the notable exception of diatom filters, aquarium filters are rarely purely mechanical in action, as bacteria will colonise most filter materials effecting some degree of biological filtration. [1]

5. Sand filter - Wikipedia

   en.wikipedia.org/wiki/Sand_filter

   A very common arrangement for these filers is composed of: anthracite on top, sand and garnet, with a support of gravel at the bottom. The depth of these filters is normally between 0.6-1 m, above 1 m the pressure drop rises sharply and less than 0.6 m reduces the thickness of each filtering layer, thus reducing its efficienciy.

6. Airstone - Wikipedia

   en.wikipedia.org/wiki/Airstone

   A spherical airstone at the Osaka Aquarium alongside a trio of red stingray pups, Hemitrygon akajei. An airstone, also called an aquarium bubbler, is a piece of aquarium furniture, traditionally a piece of limewood or porous stone, whose purpose is to gradually diffuse air into the tank, eliminating the noise and large bubbles of conventional air filtration systems, and providing other ...

7. Automated tank cleaning machine - Wikipedia

   en.wikipedia.org/wiki/Automated_tank_cleaning...

   Image depicts Gamajet automated tank cleaning machines Alfa Laval Gamajet machine lowered into a manhole for cleaning. An automated tank cleaning machine is a machine used to clean cargo, process, underground storage tanks and similar equipment such as those found in tank trucks, railroad cars, barges, oil tankers, food and beverage manufacturing facilities, chemical processing plants, ethanol ...