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2. 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]

3. 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.

4. Raceway (aquaculture) - Wikipedia

   en.wikipedia.org/wiki/Raceway_(aquaculture)

   However, in most cases it is necessary to frequently clean raceways. The simplest way is to lower the water level in the raceway units, which increases the speed of the water current, and then herd the fish together till they flush the waste from the raceway. [17] Solid wastes which accumulate at the raceway bottom can be removed by pumps. [19]

5. Aquarium filter - Wikipedia

   en.wikipedia.org/wiki/Aquarium_filter

   The pump should only be powerful enough to push the water through the filtering material as well as overcome the drag in the intake and return pipes. This makes canister filter pumps virtually insensitive to the height difference between the aquarium and the filter (although exceeding the manufacturer-specified height limit can lead to leaks).

6. Freshwater aquarium - Wikipedia

   en.wikipedia.org/wiki/Freshwater_aquarium

   Other equipment includes a canopy or hood as an aquarium cover, an aquarium stand or base, lighting accessories, a heater, a thermometer, air pumps, filtration apparatus, airstones, fish food, a fish net, water conditioner, water quality testing kits, a siphon hose or gravel cleaner, and a bucket for water changes. When first starting an ...

7. Media filter - Wikipedia

   en.wikipedia.org/wiki/Media_filter

   After filtration an under-drain piping system discharges the filtered water to an adjacent stream. A media filter is a type of filter that uses a bed of sand , peat , shredded tires, foam, crushed glass, geo-textile fabric, anthracite , crushed granite or other material to filter water for drinking, swimming pools , aquaculture , irrigation ...