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  2. Water filter - Wikipedia

    en.wikipedia.org/wiki/Water_filter

    During the 19th and 20th centuries, water filters for domestic water production were generally divided into slow sand filters and rapid sand filters (also called mechanical filters and American filters). While there were many small-scale water filtration systems prior to 1800, Paisley, Scotland is generally acknowledged as the first city to ...

  3. Slow sand filter - Wikipedia

    en.wikipedia.org/wiki/Slow_sand_filter

    Slow sand filters are recognized by the World Health Organization, [15] Oxfam, [16] and the United States Environmental Protection Agency [17] as being a superior technology for the treatment of surface water sources in small water systems. According to the World Health Organization, "Under suitable circumstances, slow sand filtration may be ...

  4. Portable water purification - Wikipedia

    en.wikipedia.org/wiki/Portable_water_purification

    Water filters can be made on-site using local materials such as sand and charcoal (e.g. from firewood burned in a special way). These filters are sometimes used by soldiers and outdoor enthusiasts. Due to their low cost they can be made and used by anyone. The reliability of such systems is highly variable.

  5. Culligan - Wikipedia

    en.wikipedia.org/wiki/Culligan

    Culligan Interglobal is a United States based global water treatment company with a network of dealers and direct operations in 90 countries with 1,000 dealers; over 600 in North America alone, and more than 14,000 employees.

  6. Soma (company) - Wikipedia

    en.wikipedia.org/wiki/Soma_(company)

    The Soma water filtration system consists of a glass carafe and a biodegradable water filter. [2] [3] [11] The filters are delivered to customers via a subscription service every two months. [2] [11] The filter was designed by David Beeman, who created the water formulas for Starbucks and Peet's Coffee. [11]

  7. Water purification - Wikipedia

    en.wikipedia.org/wiki/Water_purification

    Water passing through activated carbon is commonly used in municipal regions with organic contamination, taste or odors. Many household water filters and fish tanks use activated carbon filters to purify water. Household filters for drinking water sometimes contain silver as metallic silver nanoparticle. If water is held in the carbon block for ...

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