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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. 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 ...

  4. Harris County, Texas - Wikipedia

    en.wikipedia.org/wiki/Harris_County,_Texas

    Harris County is a county located in the U.S. state of Texas; as of the 2020 census, the population was 4,731,145, [1] making it the most populous county in Texas and the third-most populous county in the United States. Its county seat is Houston, the most populous city in Texas and fourth-most populous city in the United States. The county was ...

  5. Water softening - Wikipedia

    en.wikipedia.org/wiki/Water_softening

    Conditioning of hard water from Tempe, Arizona with different types of treatment methods [19] [20] Treatment Normalized scale formation No treatment 1.00 Electromagnetic Water Treatment 0.57 Electrically Induced Precipitation 0.50 Capacitive Deionization 0.17 Ion exchange 0.06 Template Assisted Crystallization 0.04

  6. Houston - Wikipedia

    en.wikipedia.org/wiki/Houston

    Houston (/ ˈ h juː s t ən / ⓘ HEW-stən) is the most populous city in the U.S. state of Texas and in the Southern United States.Located in Southeast Texas near Galveston Bay and the Gulf of Mexico, it is the seat of Harris County, as well as the principal city of the Greater Houston metropolitan area, the fifth-most populous metropolitan statistical area in the United States and the ...

  7. Copperfield, Texas - Wikipedia

    en.wikipedia.org/wiki/Copperfield,_Texas

    Copperfield is a series of master-planned subdivisions in unincorporated northwestern Harris County, Texas, United States. The community, developed by Friendswood Development Company, has 1,800 acres (7.3 km 2) of land. [1] Horsepen Bayou and its tributaries are within the community. [2]

  8. Houston Parks and Recreation Department - Wikipedia

    en.wikipedia.org/wiki/Houston_Parks_and...

    The Department of Public Parks was created on March 15, 1916 by a City of Houston ordinance (Chapter 23, Article 1, Section 32-2). At that time, the department had two parks — Sam Houston Park and Hermann Park.

  9. Underground soft-rock mining - Wikipedia

    en.wikipedia.org/wiki/Underground_soft-rock_mining

    Underground soft-rock mining is a group of underground mining techniques used to extract coal, oil shale, potash, and other minerals or geological materials from sedimentary ("soft") rocks. [1] Because deposits in sedimentary rocks are commonly layered and relatively less hard , the mining methods used differ from those used to mine deposits in ...

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