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Filters use sieving, adsorption, ion exchanges, biofilms and other processes to remove unwanted substances from water. Unlike a sieve or screen, a filter can potentially remove particles much smaller than the holes through which its water passes, such as nitrates or germs like Cryptosporidium.
Silt fence installed on a construction site. Silt fences are often installed as perimeter controls. They are typically used in combination with sediment basins and sediment traps, as well as with erosion controls, which are designed to retain sediment in place where soil is being disturbed by construction processes (i.e., land grading and other earthworks).
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A typical stall shower with height-adjustable nozzle and folding doors A combination shower and bathtub, with movable screen. A shower is a place in which a person bathes under a spray of typically warm or hot water. Indoors, there is a drain in the floor. Most showers are set up to have adjustable temperature, spray pressure and showerhead ...
Replacing Dad is a 1999 American television film directed by Joyce Chopra. Based on a Shelley Fraser Mickle novel, the film stars Mary McDonnell , William Russ , Jack Coleman and (a then-unknown) Shailene Woodley in her film debut.
Non-return or check valves allow the free flow of a fluid in one direction but prevent its flow in a reverse direction. They are often seen in drainage or sewage systems but may also be used in pressurized systems. Valves are available in several types, based on design and purpose: Gate, plug, or ball valves – Isolation; Globe valve ...
Rock core samples, the product of a diamond rig.A pied butcherbird perches nearby.. A core sample is a cylindrical section of (usually) a naturally-occurring substance. Most core samples are obtained by drilling with special drills into the substance, such as sediment or rock, with a hollow steel tube, called a core drill.
Bioturbation mixes sediments and changes the topography of the sediment-water interface, as shown by time lapse photography of lugworms moving through sediment. The sulfur cycle is a great example of lake nutrient cycling that occurs via biologically mediated processes as well as chemical redox reactions.