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  2. Hard water - Wikipedia

    en.wikipedia.org/wiki/Hard_water

    A bathtub faucet with built-up calcification from hard water in Southern Arizona. Hard water is water that has a high mineral content (in contrast with "soft water"). Hard water is formed when water percolates through deposits of limestone, chalk or gypsum, [1] which are largely made up of calcium and magnesium carbonates, bicarbonates and sulfates.

  3. Water softening - Wikipedia

    en.wikipedia.org/wiki/Water_softening

    Water softening is the removal of calcium, magnesium, and certain other metal cations in hard water. The resulting soft water requires less soap for the same cleaning effort, as soap is not wasted bonding with calcium ions. Soft water also extends the lifetime of plumbing by reducing or eliminating scale build-up in pipes

  4. HSAB theory - Wikipedia

    en.wikipedia.org/wiki/HSAB_theory

    HSAB is an acronym for "hard and soft (Lewis) acids and bases".HSAB is widely used in chemistry for explaining the stability of compounds, reaction mechanisms and pathways. It assigns the terms 'hard' or 'soft', and 'acid' or 'base' to chemical species.

  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. Purified water - Wikipedia

    en.wikipedia.org/wiki/Purified_water

    Softened water cannot be considered as truly demineralized water, but does no longer contain cations responsible for the hardness of water and causing the formation of limescale, a hard chalky deposit essentially consisting of CaCO 3, building up inside kettles, hot water boilers, and pipework.

  7. These Are the Best Hard Water Shampoos for Healthier ... - AOL

    www.aol.com/lifestyle/13-best-hard-water...

    Hard Water Wellness Shampoo. For glossier, easier-to-manage strands, both Haiti and Moser recommend this vegan, plant-based shampoo. With ingredients like nourishing panthenol, strengthening rice ...