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  2. Water filter - Wikipedia

    en.wikipedia.org/wiki/Water_filter

    A large-scale flocculation 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 ...

  3. 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.

  4. Reverse osmosis - Wikipedia

    en.wikipedia.org/wiki/Reverse_osmosis

    Around the world, household drinking water purification systems, including a RO step, are commonly used for improving water for drinking and cooking. Such systems typically include these steps: a sediment filter to trap particles, including rust and calcium carbonate

  5. Water purification - Wikipedia

    en.wikipedia.org/wiki/Water_purification

    Membrane filters are widely used for filtering both drinking water and sewage. For drinking water, membrane filters can remove virtually all particles larger than 0.2 μm—including giardia and cryptosporidium.

  6. Sand filter - Wikipedia

    en.wikipedia.org/wiki/Sand_filter

    Sand filter. 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.

  7. 30 more drinking water systems in RI may need to filter out ...

    www.aol.com/30-more-drinking-water-systems...

    Alex Kuffner, Providence Journal. April 12, 2024 at 5:17 AM. PROVIDENCE – About 30 additional public drinking water systems in Rhode Island may need to install systems to filter out...

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