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  2. Wratten number - Wikipedia

    en.wikipedia.org/wiki/Wratten_number

    Wratten number. Wratten numbers are a labeling system for optical filters, usually for photographic use comprising a number sometimes followed by a letter. The number denotes the color of the filter and its spectral characteristics, and these numbers can be grouped into broad categories, but the numbering system is arbitrary within a group and ...

  3. Ceramic water filter - Wikipedia

    en.wikipedia.org/wiki/Ceramic_water_filter

    A Victorian ceramic water filter. Ceramic water filters (CWF) are an inexpensive and effective type of water filter that rely on the small pore size of ceramic material to filter dirt, debris, and bacteria out of water. This makes them ideal for use in developing countries, [1] and portable ceramic filters are commonly used in backpacking. [2]

  4. 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 .

  5. Backwashing (water treatment) - Wikipedia

    en.wikipedia.org/wiki/Backwashing_(water_treatment)

    Water to be filtered is then applied to the filter surface until the filter clogs and the backwash cycle needs to be repeated. [3]: 264–8 [4]: 10.53–10.58 [5]: 937–9 [6]: 8.11–8.18 [7]: 353–6 Some water treatment filters use surface wash systems that break up the heavily clogged, granular media surface layer.

  6. LG's new ThinQ recipe service sources ingredients ... - Engadget

    www.engadget.com/lg-thinq-recipe-service...

    The new appliances with ThinQ recipe will be shown at LG's virtual exhibition booth at CES 2022 starting on January 5th, though LG didn't say when the app and appliances would go on sale.

  7. The best electric kettle - Engadget

    www.engadget.com/2018-09-14-the-best-electric...

    The Cuisinart CPK-17 also has all the other features we look for in an electric model, including a removable scale filter for easier cleaning, a concealed heating element that won't get gunked up ...

  8. Water purification - Wikipedia

    en.wikipedia.org/wiki/Water_purification

    Simple techniques for treating water at home, such as chlorination, filters, and solar disinfection, and for storing it in safe containers could save a huge number of lives each year. [52] Reducing deaths from waterborne diseases is a major public health goal in developing countries. The global water purification market is worth 22 billion ...

  9. The Nokia 8110 4G is smarter than your average dumb phone

    www.engadget.com/2018-08-24-nokia-8110-4g.html

    It was more a modern reimagining of the turn-of-the-century icon than a true relaunch. The same is true of the Nokia 8110 4G, but that's a good thing. The 8110 came to market in 1996, complete ...

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