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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. 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 ...

  4. Salt water chlorination - Wikipedia

    en.wikipedia.org/wiki/Salt_water_chlorination

    Salt water chlorination is a process that uses dissolved salt (1000–4000 ppm or 1–4 g/L) for the chlorination of swimming pools and hot tubs.The chlorine generator (also known as salt cell, salt generator, salt chlorinator, or SWG) uses electrolysis in the presence of dissolved salt to produce chlorine gas or its dissolved forms, hypochlorous acid and sodium hypochlorite, which are already ...

  5. Hayward Area Recreation and Park District - Wikipedia

    en.wikipedia.org/wiki/Hayward_Area_Recreation...

    Hayward Area Recreation and Park District. The Hayward Area Recreation and Park District (H.A.R.D.) is the park management agency for most of the parks in the city of Hayward, California. It was created in 1944 [1] and is an independent special district under California law. [2] H.A.R.D. is the largest recreation district in California. [3]

  6. Depth filter - Wikipedia

    en.wikipedia.org/wiki/Depth_filter

    Depth filter. Depth filters are filters that use a porous filtration medium to retain particles throughout the medium, rather than just on the surface of the medium. Depth filtration, typified by multiple porous layers with depth, is used to capture the solid contaminants from the liquid phase. [1] These filters are commonly used when the fluid ...

  7. Sand filter - Wikipedia

    en.wikipedia.org/wiki/Sand_filter

    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.

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