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  2. Zeolite - Wikipedia

    en.wikipedia.org/wiki/Zeolite

    Zeolites are used in laundry detergent as water softeners, removing Ca 2+ and Mg 2+ ions which would otherwise precipitate from the solution. The ions are retained by the zeolites which releases Na + ions into the solution, allowing the laundry detergent to be effective in areas with hard water.

  3. Water softening - Wikipedia

    en.wikipedia.org/wiki/Water_softening

    The surface of human skin has a light charge that the soap tends to bind with, requiring more effort and a greater volume of water to remove. [4] Hard water contains calcium or magnesium ions that form insoluble salts upon reacting with soap, leaving a coating of insoluble stearates on tub and shower surfaces, commonly called soap scum. [4] [5]

  4. 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.

  5. Ethylenediaminetetraacetic acid - Wikipedia

    en.wikipedia.org/wiki/Ethylenediaminetetraacetic...

    Ethylenediaminetetraacetic acid (EDTA), also called EDTA acid, is an aminopolycarboxylic acid with the formula [CH 2 N(CH 2 CO 2 H) 2] 2.This white, slightly water-soluble solid is widely used to bind to iron (Fe 2+ /Fe 3+) and calcium ions (Ca 2+), forming water-soluble complexes even at neutral pH.

  6. Ion exchange - Wikipedia

    en.wikipedia.org/wiki/Ion_exchange

    Selective removal: Ion exchange resins can be designed to selectively remove specific ions from water. High efficiency: Ion exchange processes can achieve high removal efficiencies for targeted ions. Regenerability: Ion exchange resins can be regenerated multiple times by flushing them with a regenerating solution, extending their lifespan and ...

  7. Sand filter - Wikipedia

    en.wikipedia.org/wiki/Sand_filter

    Cooling water production, drinking water preparation, pre-filtration in active carbon treatments and membrane systems, and the filtration of swimming pool water. Iron-removal from groundwater using aeration and sand filtration.

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