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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. 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

  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. 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.

  6. Copperfield, Texas - Wikipedia

    en.wikipedia.org/wiki/Copperfield,_Texas

    Friendswood Development Company bought 1,800 acres (7.3 km 2) at the corner of Texas State Highway 6 and Farm to Market Road 529 from the Gus Wortham estate in 1977. Two years later the first houses in Copperfield had been built and sold.

  7. Geography of Houston - Wikipedia

    en.wikipedia.org/wiki/Geography_of_Houston

    The north and northwestern regions of Houston and Harris County feature a slightly steeper slope than other parts of the city, with occasional escarpments caused by faulting or erosion. [6] The sedimentary layers underneath Houston ultimately extend down some 60,000 feet (18,000 m), with the oldest beds deposited during the Cretaceous. [7]

  8. Groundwater remediation - Wikipedia

    en.wikipedia.org/wiki/Groundwater_remediation

    Groundwater remediation is the process that is used to treat polluted groundwater by removing the pollutants or converting them into harmless products. Groundwater is water present below the ground surface that saturates the pore space in the subsurface.

  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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