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The Hippo water roller, or Hippo roller, is a device used to carry drinking water more easily and efficiently than traditional methods, particularly in the developing world and rural areas. It consists of a barrel-shaped container that holds the water and can roll along the ground, and a handle attached to the axis of the barrel.
A media-based grow bed is a hydroponic system type that utilizes a trough filled with an inert material to assist plant roots and accommodate beneficial microbes. Water is usually delivered in a flooding and draining cycle (ebb and flow), delivering nutrients and oxygen to the plants. [7]
Lower levels of damage in some species of sponges cultured via mesh bags can lead to higher levels of survival. Growth rates may be decreased as mesh strands on the bags may decrease water flow, limiting food availability. [21] The accumulation of biofouling agents such as bryozoans, ascidians and algae on the mesh may further limit water flow ...
Deep water culture (DWC) is a hydroponic method of plant production by means of suspending the plant roots in a solution of nutrient-rich, oxygenated water. Also known as deep flow technique (DFT), floating raft technology (FRT), or raceway, this method uses a rectangular tank less than one foot deep filled with a nutrient-rich solution with ...
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The drum line consists of a floating drum (a barrel) with two lines attached to it. One line is attached to an anchor on the sea floor, while the other features a large baited shark hook. The drum is filled with a rigid polyurethane foam, which keeps it buoyant and prevents it from being stolen for use as a storage vessel. [10]