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  2. Shade ball - Wikipedia

    en.wikipedia.org/wiki/Shade_ball

    Shade balls in a European hotel swimming-pool. A shade ball is a small plastic sphere floated on top of a reservoir for environmental reasons, including to slow evaporation and prevent sunlight from causing reactions among chemical compounds present in the water.

  3. Water aeration - Wikipedia

    en.wikipedia.org/wiki/Water_aeration

    Fine bubble aeration is an efficient technique of aeration in terms of oxygen transfer due to the large collective surface area of its bubbles. Fine bubble aeration is an efficient way to transfer oxygen to a water body. [8] A compressor on shore pumps air through a hose, which is connected to an underwater aeration unit.

  4. Garden pond - Wikipedia

    en.wikipedia.org/wiki/Garden_pond

    This garden pond has two ponds separated by a waterfall with a one-foot drop; generally, the fish in the upper pond are smaller, and ones in the lower pond are larger. Ponds may be created by natural processes or by people; however, the origin of the hole in the ground makes little difference to the kind of wildlife that will be found in the pond.

  5. Fine bubble diffusers - Wikipedia

    en.wikipedia.org/wiki/Fine_bubble_diffusers

    Average bubble diameters of 0.9 mm are possible nowadays, using special polyurethane (PUR) or special recently developed EPDM membranes. [3] Fine bubble diffusers have largely replaced coarse bubble diffusers and mechanical aerators in most of the developed world and in much of the developing world. The exception would be in secondary treatment ...

  6. Gerridae - Wikipedia

    en.wikipedia.org/wiki/Gerridae

    They are generally small, long-legged insects and the body length of most species is between 2 and 12 mm (0.08–0.47 in). A few are between 12 and 25 mm (0.47–0.98 in). [ 5 ] Among widespread genera, the North Hemisphere Aquarius includes the largest species, generally exceeding 12 mm (0.47 in), at least among females, and the largest ...

  7. Activated sludge - Wikipedia

    en.wikipedia.org/wiki/Activated_sludge

    Activated sludge tank at Beckton sewage treatment plant, UK.The white bubbles are due to the diffused air aeration system. The activated sludge process is a type of biological wastewater treatment process for treating sewage or industrial wastewaters using aeration and a biological floc composed of bacteria and protozoa.

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