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  2. Sand filter - Wikipedia

    en.wikipedia.org/wiki/Sand_filter

    Sand filter. Sand filter used for water treatment. Sand filters are used as a step in the water treatment process of water purification . There are three main types; rapid (gravity) sand filters, upward flow sand filters and slow sand filters. All three methods are used extensively in the water industry throughout the world.

  3. Swimming pool sanitation - Wikipedia

    en.wikipedia.org/wiki/Swimming_pool_sanitation

    Other filter media that have been introduced to the residential swimming pool market since 1970 include sand particles and paper type cartridge filters of 50 to 150 square feet (4.6 to 13.9 m 2) filter area arranged in a tightly packed 12" diameter x 24" long (300 mm x 600 mm) accordion-like circular cartridge. These units can be 'daisy-chained ...

  4. Hayward Fault Zone - Wikipedia

    en.wikipedia.org/wiki/Hayward_Fault_Zone

    The Hayward Fault Zone is a right-lateral strike-slip geologic fault zone capable of generating destructive earthquakes. The fault was first named in the Lawson Report of the 1906 San Francisco Earthquake in recognition of its involvement in the earthquake of 1868. [ 1 ] This fault is about 119 km (74 mi) long, [ 2 ] situated mainly along the ...

  5. List of accidents and incidents involving the Boeing B-52 ...

    en.wikipedia.org/wiki/List_of_accidents_and...

    A Boeing B-52H Stratofortress in flight. The Boeing B-52 Stratofortress has been operational with the United States Air Force since 5 June 1955. This list is of accidents and incidents involving the B-52 resulting in loss of life, severe injuries, or a loss of an aircraft (damaged beyond repair).

  6. Slow sand filter - Wikipedia

    en.wikipedia.org/wiki/Slow_sand_filter

    Slow sand filter. 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 be rectangular or cylindrical in cross section and are used primarily to treat surface water. The length and breadth of the tanks are determined by the flow rate desired for ...

  7. Rapid sand filter - Wikipedia

    en.wikipedia.org/wiki/Rapid_sand_filter

    Rapid sand filter. The rapid sand filter or rapid gravity filter is a type of filter used in water purification and is commonly used in municipal drinking water facilities as part of a multiple-stage treatment system. [ 1] These systems are complex and expensive to operate and maintain, and therefore less suitable for small communities and ...

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