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- 20:01, 12 August 2019 Leebo talk contribs deleted page CH (content was: "#REDIRECT Calcium Hardness", and the only contributor was "Leebo" (talk))
- 19:59, 12 August 2019 Leebo talk contribs moved page CH to Calcium Hardness
- 21:42, 11 August 2019 Leebo talk contribs created page CH (Created page with "Calcium hardness (CH) is the direct measure of the amount of calcium ions (Ca2+) in your pool water. Calcium hardness is different from total hardness (TH) or general hardness...")