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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 ...
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 ...
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.
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).
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.
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