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  2. Water softening - Wikipedia

    en.wikipedia.org/wiki/Water_softening

    Brine draw: Water is directed through a jet pump, which pulls salt water from the brine tank, before the water and brine pass through the resin bed in the normal direction, if co-current, or in the reverse direction, if counter-current. [12] The output of this typically thirty-minute process is discarded through the drain hose.

  3. Rockwell hardness test - Wikipedia

    en.wikipedia.org/wiki/Rockwell_hardness_test

    A Rockwell hardness tester. The Rockwell hardness test is a hardness test based on indentation hardness of a material. The Rockwell test measures the depth of penetration of an indenter under a large load (major load) compared to the penetration made by a preload (minor load). [1]

  4. Meyer hardness test - Wikipedia

    en.wikipedia.org/wiki/Meyer_hardness_test

    The Meyer hardness test is a hardness test based upon projected area of an impression. The hardness, H {\displaystyle H} , is defined as the maximum load, P max {\displaystyle P_{\text{max}}} divided by the projected area of the indent, A p {\displaystyle A_{\text{p}}} .

  5. Lime softening - Wikipedia

    en.wikipedia.org/wiki/Lime_softening

    Lime softening (also known as lime buttering, lime-soda treatment, or Clark's process) [1] is a type of water treatment used for water softening, which uses the addition of limewater (calcium hydroxide) to remove hardness (deposits of calcium and magnesium salts) by precipitation.

  6. Menards - Wikipedia

    en.wikipedia.org/wiki/Menards

    Menards sold the Menard Building Division in 1994, racking up 36 years in the pole building industry. Menards of East Madison, Wisconsin, pictured in 2012 (closed and relocated to Sun Prairie in 2018) [6] Menards was founded as Menard Cashway Lumber. In the mid-1980s, the "Cashway Lumber" name was dropped and the business became simply known to ...

  7. Hardness scales - Wikipedia

    en.wikipedia.org/wiki/Hardness_scales

    The Meyer hardness test; The Knoop hardness test; Other hardness scales. Hardness scales may also refer to: Methods of measuring the deposit formation by hard water.

  8. Water testing - Wikipedia

    en.wikipedia.org/wiki/Water_testing

    The Ministry has created 24 Water Quality Testing Laboratories across Pakistan, developed and commercialized water quality test kits, water filters, water disinfection tablets and drinking water treatment sachets, conducted training for 2,660 professionals of water supply agencies and surveyed 10,000 water supply schemes out of a grand total of ...

  9. Brinell hardness test - Wikipedia

    en.wikipedia.org/wiki/Brinell_hardness_test

    The Brinell hardness is designated by the most commonly used test standards (ASTM E10-14 [2] and ISO 6506–1:2005) as HBW (H from hardness, B from brinell and W from the material of the indenter, tungsten (wolfram) carbide). In former standards HB or HBS were used to refer to measurements made with steel indenters.

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