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  2. 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 .

  3. 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 ...

  4. Sand filter - Wikipedia

    en.wikipedia.org/wiki/Sand_filter

    Sand filter. Sand filter used for water treatment. 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.

  5. Do You Really Need a Water Filter? - AOL

    www.aol.com/really-water-filter-144247487.html

    They do not, however, filter out viruses and bacteria. Other filters need a plumber or a home handyperson to install. They sit either on the countertop or under the sink, at just a single faucet ...

  6. International English Language Testing System - Wikipedia

    en.wikipedia.org/wiki/International_English...

    International English Language Testing System (IELTS / ˈ aɪ. ɛ l t s /) [6] is an international standardized test of English language proficiency for non-native English language speakers. It is jointly managed by the British Council, IDP and Cambridge English, [6] and was established in 1989. IELTS is one of the major English-language tests ...

  7. Total suspended solids - Wikipedia

    en.wikipedia.org/wiki/Total_suspended_solids

    Total suspended solids. Total suspended solids ( TSS) is the dry-weight of suspended particles, that are not dissolved, in a sample of water that can be trapped by a filter that is analyzed using a filtration apparatus known as sintered glass crucible. TSS is a water quality parameter used to assess the quality of a specimen of any type of ...

  8. Electromagnetic absorption by water - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_absorption...

    Overview. The water molecule, in the gaseous state, has three types of transition that can give rise to absorption of electromagnetic radiation: Rotational transitions, in which the molecule gains a quantum of rotational energy. Atmospheric water vapour at ambient temperature and pressure gives rise to absorption in the far-infrared region of ...

  9. Great Filter - Wikipedia

    en.wikipedia.org/wiki/Great_Filter

    Great Filter. The Great Filter is the idea that, in the development of life from the earliest stages of abiogenesis to reaching the highest levels of development on the Kardashev scale, there is a barrier to development that makes detectable extraterrestrial life exceedingly rare. [ 1][ 2] The Great Filter is one possible resolution of the ...