Talk:Hard water
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What is the level of hard water in Charlottsville, Virginia Beach, Richmond, Well water, and Washington D.C.?
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[edit] Permanent Hardness
An anonymous contributor asserted this:
"It has to be in more then 50gms/dm3 in concentration to be called permanent hard water."
Any back-up/citation for this?
WLD 10:20, 25 March 2006 (UTC)
http://www.keidel.com/resource/water/hard.htm
[edit] Hot Lime Softening
In industrial processes, boiler operation in particular, water is often softened with a Hot-Lime softener, I have done superficial wiki searches and haven't come up with anything referring to hot-lime softening. If anyone can clarify this for me, that'd be great. Otherwise, I will create an article about Hot-Lime softeners. 161.19.64.5 02:25, 17 April 2006 (UTC)
[edit] Stain?
The deposites of Calcium, Limescale, ect. left after hard water has been on a surface and evaporated is often refered to as hard water; however, this is ironic as there is no longer any water present.
Isn't this called a hard water stain? PrometheusX303 20:10, 16 May 2006 (UTC)
[edit] Apparent Error in Article
The conversion from mg/L of calicum to other hardness scales seems to be bogus. For example, the conversion in the article to German degrees says that 3mg/L of calcium equals 21°dH. According to information I have from a water-testing kit, 21°dH is very hard water. However, other sources on the web say that 3mg/L is very soft water. Perhaps instead of "divide by", the author meant "multiply by".
- Read the article carefully - it does not say what you think it does. 21°dH converts to 150 mg/L, which is 'Very Hard'. 21 divided by 0.14 is 150. WLD 21:10, 15 October 2006 (UTC)
[edit] Doubful etymology
"Earlier generations coined the phrase 'hard water' because it made cleaning difficult. Hardness is caused by compounds of calcium and magnesium. All freshwater sources contain calcium and magnesium in varying quantities."
That sounds suspect - the opposite of hard water is soft water, not easy water, plus other languages use words for "hard" water which don't include the meaning "difficult". Zocky | picture popups 02:27, 7 November 2006 (UTC)
The correct etymology is from the hardness of beans soaked or cooked in various waters. I first came across this in a chemistry book I read over 40 years ago. The fact that it does vary the hardness of beans is easily verified. 216.179.3.33 16:53, 9 March 2007 (UTC)robgood@bestweb.net
- If you can cite the book, fine, but it is an extraordinary claim. I would suggest that the book in question may well be incorrect, but as Wikipedia is based on verifiability, not truth, if you can cite it, it would belong in the article. Regards, WLDtalk|edits 17:09, 9 March 2007 (UTC)
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- I checked the referred pdf, and the references given in it. The given pdf does not say the origin of the term 'hard water' is from the behaviour of cooked beans. Of the three references cited in the pdf, the two web references are no longer valid. A better citation would be required. Best. WLDtalk|edits 18:31, 9 March 2007 (UTC)
[edit] Advertisement
This seems to be a marketing exercise for water softeners - "unsightly spots on dishes" indeed. Colonel Mustard 03:08, 28 November 2006 (UTC)
[edit] Conversion to/from Clarks seems off
I have also encountered a problem with the conversion table (under Types of Measurement). The formula x Clark degrees / 0.175 = y ppm seems off.
In the conversion table it says conversion to mg/L calcium: divide by 0.175. Put to practice: I have 1 Clark degree. To get mg/L I divide by 0.175, i.e. approx. 5.7 mg/L, which should be the same as 5.7 ppm. Yet in the next line One degree Clark corresponds to one grain of calcium carbonate in one Imperial gallon of water which is equivalent to 14.28 parts calcium carbonate in 1,000,000 parts water. – i.e. 14.28 parts per million.
The University of North Carolina's Dictionary of Units Measurement also states the Clark degree is defined as 1 part of calcium carbonate per 70 000 parts of water; this is about 14.3 parts per million (ppm). And Global Water Instrumentation, Inc. has a table stating that 1 ppm = 0.07 Clark degrees, which corresponds to 1 Clark degree = 14.3 ppm.
Could someone check this pls? I’m just a translator attempting to convert French water hardness levels into English ones. Merci beaucoups. 85.207.119.184 16:26, 17 December 2006 (UTC)
[edit] Vandalism Corrected
I have corrected vandalism within the first line of the article. Please view the revision history for details. Chrisbrl88 08:38, 25 February 2007 (UTC)
[edit] World-wide view
How is hard-water viewed in non-English speaking parts of the world? Why do we need a warning tag that warns us that this is not a global world-view on Hard Water? Do people in China doubt that Australia has hard water issues? I don't get it, so I'm removing the tag. Vivaldi (talk) 05:33, 25 March 2007 (UTC)
