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  2. Hard water - Wikipedia

    en.wikipedia.org/wiki/Hard_water

    Analysis of water hardness in major Australian cities by the Australian Water Association shows a range from very soft (Melbourne) to hard (Adelaide). Total hardness levels of calcium carbonate in ppm are: Canberra: 40 [33] Melbourne: 10–26 [34] Sydney: 39.4–60.1 [35] Perth: 29–226 [36] Brisbane: 100 [37] Adelaide: 134–148 [38] Hobart ...

  3. Swimming pool sanitation - Wikipedia

    en.wikipedia.org/wiki/Swimming_pool_sanitation

    Total alkalinity should be 80–120 ppm and calcium hardness between 200 ... it is very important to keep the pH of the pool in the range 7.2 to 7.8 – according ...

  4. Hardnesses of the elements (data page) - Wikipedia

    en.wikipedia.org/wiki/Hardnesses_of_the_elements...

    This page was last edited on 16 November 2024, at 12:16 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.

  5. Grain per gallon - Wikipedia

    en.wikipedia.org/wiki/Grain_per_gallon

    The grain per gallon (gpg) is a unit of water hardness defined as 1 grain (64.8 milligrams) of calcium carbonate dissolved in 1 US gallon of water (3.785412 L). It translates into 1 part in about 58,000 parts of water or 17.1 parts per million (ppm). Also called Clark degree (in terms of an imperial gallon).

  6. Calcium - Wikipedia

    en.wikipedia.org/wiki/Calcium

    As an example of the wide range of solubility of calcium compounds, monocalcium phosphate is very soluble in water, 85% of extracellular calcium is as dicalcium phosphate with a solubility of 2.00 mM, and the hydroxyapatite of bones in an organic matrix is tricalcium phosphate with a solubility of 1000 μM.

  7. 5 New Wellness Resorts That Will, Literally, Change Your Life

    www.aol.com/5-wellness-resorts-literally-change...

    More than 20 geothermal pools, a variety of classes and activities, on-site state-of-the-art gym, newly renovated spa with unique treatments, on-site farm-to-table restaurant. Don’t-Miss Treatments:

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