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  2. Portable water purification - Wikipedia

    en.wikipedia.org/wiki/Portable_water_purification

    Portable water purification unit used by International Red Cross and Red Crescent. Portable water purification devices are self-contained, easily transported units used to purify water from untreated sources (such as rivers, lakes, and wells) for drinking purposes. Their main function is to eliminate pathogens, and often also of suspended ...

  3. Water filter - Wikipedia

    en.wikipedia.org/wiki/Water_filter

    A water filter removes impurities by lowering contamination of water using a fine physical barrier, a chemical process, or a biological process. Filters cleanse water to different extents, for purposes such as: providing agricultural irrigation, accessible drinking water, public and private aquariums, and the safe use of ponds and swimming pools .

  4. Water purification - Wikipedia

    en.wikipedia.org/wiki/Water_purification

    Water purification is the process of removing undesirable chemicals, biological contaminants, suspended solids, and gases from water. The goal is to produce water that is fit for specific purposes. Most water is purified and disinfected for human consumption ( drinking water ), but water purification may also be carried out for a variety of ...

  5. History of water filters - Wikipedia

    en.wikipedia.org/wiki/History_of_water_filters

    The history of water filters can be traced to the earliest civilisations with written records. Water filters have been used throughout history to improve the safety and aesthetics of water intended to be used for drinking or bathing. In modern times, they are also widely used in industry and commerce. The history of water filtration is closely ...

  6. Slave quarters in the United States - Wikipedia

    en.wikipedia.org/wiki/Slave_quarters_in_the...

    Plantation slavery had regional variations dependent on which cash crop was grown, most commonly cotton, hemp, indigo, rice, sugar, or tobacco. [3] Sugar work was exceptionally dangerous—the sugar district of Louisiana was the only region of the United States that saw consistent population declines, despite constant imports of new slaves.

  7. Waveguide filter - Wikipedia

    en.wikipedia.org/wiki/Waveguide_filter

    Waveguide post filter: a band-pass filter consisting of a length of WG15 (a standard waveguide size for X band use) divided into a row of five coupled resonant cavities by fences of three posts each. The ends of the posts can be seen protruding through the wall of the guide. A waveguide filter is an electronic filter constructed with waveguide ...

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