A deep sand bed is a filtration method used in some saltwater aquariums and some freshwater aquariums. A deep sand bed, similar to the Berlin Method, is...

sand filters). Overall, there are several categories of sand bed filter: rapid (gravity) sand filters rapid (pressure) sand bed filters upflow sand filters...

fluidized bed filter (FBF) is a biological reactor only. The principle is to direct water through a sand (or similar media) bed from below so that the sand becomes...

reduction of nitrate, a waste product in an incomplete nitrogen cycle. Deep sand bed opponents may prefer a "bare bottom" or "suspended reef" which allows...

Slow sand filters are used in water purification for treating raw water to produce a potable product. They are typically 1–2 m (3.3–6.6 ft) deep, can...

sediment-dwelling animals that live in the deep sand bed of marine aquariums or reef aquariums such as sand sifting starfish, spaghetti worms, bristleworms...

is an active part of human daily life. For example, an ornamental flower bed may be considered a biotope (though a rather small one) since it enhances...

filtration involving the substrate include the undergravel filter and the deep sand bed. Planted tanks require a substrate that will remain loose enough for...

directed into the designed treatment area, which conventionally consists of a sand bed (which serves as a transition to the actual soil), a filter media layer...

state, with algae (sometimes in the form of an algae scrubber) and a deep sand bed providing filtration, or as "show tanks", with the rock kept largely...