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  2. 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 ...

  3. 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.

  4. Swimming pool - Wikipedia

    en.wikipedia.org/wiki/Swimming_pool

    A swimming pool, swimming bath, wading pool, paddling pool, or simply pool, is a structure designed to hold water to enable swimming or other leisure activities. Pools can be built into the ground (in-ground pools) or built above ground (as a freestanding construction or as part of a building or other larger structure), and may be found as a ...

  5. 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 ...

  6. Backwashing (water treatment) - Wikipedia

    en.wikipedia.org/wiki/Backwashing_(water_treatment)

    Backwashing is a form of preventive maintenance so that the filter media can be reused. In water treatment plants, backwashing can be an automated process that is run by local programmable logic controllers (PLCs). The backwash cycle is triggered after a set time interval, when the filter effluent turbidity is greater than a treatment guideline ...

  7. Water purification - Wikipedia

    en.wikipedia.org/wiki/Water_purification

    Slow "artificial" filtration (a variation of bank filtration) into the ground at the Water purification plant KĂ¡ranĂ½, Czech Republic A profile of layers of gravel, sand and fine sand used in a slow sand filter plant. Slow sand filters may be used where there is sufficient land and space, as the water flows very slowly through the filters ...

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