Talk:Hard water

message: Hi, 
There is a formula missing that was in the old section:
CaCO3(s) + H2O(l) + CO2(g) ⇌  Ca2+(aq) + 2HCO3-(aq)
Please put it back!
--Lenny B Good (talk) 06:31, 20 February 2008 (UTC)
thread_title:  Formula Missing 

message: Hard water usually consists of calcium, magnesium ions, and possibly other dissolved compounds such as bicarbonates and sulfates.
Pardon? Is there any water in this hardness? uFu (talk) 05:33, 10 January 2008 (UTC)
thread_title:  Lead? 

message: New Definition for hard water has been added to this topic. If any one needs any kind of help in any topic may email to online.vcet@gmail.com --Thooyavan 04:10, 4 December 2007 (UTC)
thread_title:  Hard Water 

message: 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)
thread_title:  Permanent Hardness 

message: 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)
thread_title:  Hot Lime Softening 

message: 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)
thread_title:  Stain? 

message: "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)
replies: text: 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)
replies: text: 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)

text: It way predates the civil war.  See the 1712 book The Natural History of Northamptonshire, by John Morton.  Dicklyon (talk) 00:05, 18 November 2014 (UTC)
thread_title:  Doubtful etymology 

message: This seems to be a marketing exercise for water softeners - "unsightly spots on dishes" indeed. Colonel Mustard 03:08, 28 November 2006 (UTC)
replies: text: Well, I have very hard water at my house and yes, you have to towel-dry your dishes or there are spots even from just a drop, all our plumbing fixtures are encrusted, and if you leave a pan of water out and it all dries up, good luck getting that scale off... I'm no fan of water softeners but it is a legitimate observation. (140.232.0.70 (talk) 17:37, 24 November 2010 (UTC)
thread_title:  Advertisement 

message: 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)
replies: text: You are correct.  Formerly, the article tried to define these units and conversion factors in terms of calcium *ion* concentrations, rather than as concentrations of the actual calcium compounds (CaCO3, CaO) used in the original definitions.  While not strictly speaking incorrect, these descriptions were confusing, imprecise, and unhelpful. This has now been fixed in the article.24.72.118.223 (talk) 00:22, 27 January 2009 (UTC)
thread_title:  Conversion to/from Clarks seems off 

message: 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)
thread_title:  Vandalism Corrected 

message: 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)
thread_title:  World-wide view 

message: In the early Flash comics of the 1940s, Jay Garrick's fantastic speed is attributed to inhaling "hard water fumes" that render him a "freak of science".  See here for comical mumbo-jumbo. Asat 02:40, 17 September 2007 (UTC)
replies: text: Sounds like somebody had hard water confused with heavy water. Not that heavy water has "fumes" (it has vapor or steam, just like regular water) or is going to turn you into a "freak of science". But it is slightly radioactive, so a reference to it makes a little more sense. In a comic book, that is! Isaac R (talk) 20:21, 6 October 2008 (UTC)
thread_title:  Hard, heavy, WTF's the big difference anyway? 

message: I am aware that there are magnetic appliances that can remove the hardness in water. If some one knows more about this, I feel it would be beneficial for it to be included in this article.  —Preceding unsigned comment added by Claughton (talk • contribs) 16:38, 7 February 2008 (UTC)
thread_title:  Magnetic Water Conditioners 

message: Surely the calcium ions present in water provide health benefits to the bones and teeth, like calcium in the food?
Mad.martian999 (talk) 13:45, 14 March 2008 (UTC)
replies: text: I've heard that. Supposedly the hardness of the water in Kentucky (the whole state is on a huge calcium carbonate shelf) is one reason that state is famous for its horses — stronger bones. (It's also said to enhance the flavor of their Bourbon.) But this could be a myth: water hardness is measured in parts per million, meaning you'd have to drink a lot of hard water to get your MDA. More hard data is needed before we can add this tidbit. --Isaac R (talk) 18:21, 18 August 2008 (UTC)

text: Calcium and magnesium can be a boon for people without enough in their diet (which for magnesium is a lot of people), but can also be over-consumed.  It would seem that sufficiently hard water has enough minerals in it to require accounting for, in individuals who are sensitive to Milk-alkali_syndrome for example.  It would be nice if someone with nutritionist creds could speak to the bio-availability of the minerals in hard water, though it would seem to the layman (like me) that hard water and a Rolaids dissolved in soft water would be roughly equivalent, but who knows maybe some other factors prevent absorbtion.  If we can get some confirmation on bio-availability, maybe linking the hard water article in on the pages for dietary magnesium and the section on the antacid page about health effects and relevant sub-pages might be in order. (140.232.0.70 (talk) 17:30, 24 November 2010 (UTC)
thread_title:  Calcium ion health benefits/concerns 

message: This article has lots of interesting technical details. But it doesn't explain why people care about water hardness, and spend so much money softening it. --Isaac R (talk) 18:23, 18 August 2008 (UTC)
thread_title:  Why do we care? 

message: "Hardness in water is defined as the presence of multivalent cations."
"... a single-number scale does not adequately describe hardness" -> it does it's expressed for example in °f.
It probably means that a classification water from (very) soft to (very) hard  is not universal.  —Preceding unsigned comment added by 84.196.128.79 (talk) 10:33, 20 August 2008 (UTC)
replies: text: The first sentence describe a qualitative measure (i.e., it's either hard or not), the second a quantitative measure (if hard, then how hard is it). 78.22.161.214 (talk) 18:17, 28 October 2008 (UTC)

text: It might also be referring to the fact that there are different ions involved, not just always Calcium. (140.232.0.70 (talk) 17:41, 24 November 2010 (UTC)
thread_title:  These twe sentences can't both be right 

message: I was interested in the number of households with hard water, so I went to the USGS site to try to find where this statistic came from and could not find it anywhere!  The USGS does analysis of ground water and surface water and wells (whichever category those go in), not the water coming out of people's taps in their homes, so how could this be a USGS statistic that "households" have hard or soft water?  I was hoping that someone at USGS had at least done something like multiplied the population of different areas by the type of ground/surface water prevalent in that area, but that doesn't seem to be the case.  Even then you'd have to make assumptions about the prevalence of water softeners in homes.  If anyone can find the primary citation for this "fact" it would improve the accuracy of this article.--Libravore (talk) 23:17, 15 April 2009 (UTC)
thread_title:  USGS information 

message: This is regarding a confusing comment in italics.  There is an aside that states, “This scale is in substantial disagreement with the references.”  The comment is intended as a warning.  What is not clear is the confidence that the authors/editors have in the following table.  Nor does the “Wikipedia:Manual of Style”, make the purpose clear other than to add emphisis.  I assume the author is also in substantial disagreement with the references--"This scale is in substantial disagreement with the references, which are considered inaccurate."  However, one could assume that the editors are uncertain why the table is in substantial disagreement with the references--"This scale is in substantial disagreement with the references, which may be more accurate."
--Tychicusole (talk) 17:15, 27 July 2010 (UTC)
replies: text: Comment replaced with citation request. Vsmith (talk) 18:21, 27 July 2010 (UTC)
thread_title:  Measurement 

message: * I lived in Rugby, Warwickshire (England) until 1964, and the town tap water was very hard. Rain water (which is soft) that fell on the back part of our house's roof was collected in an open tank on the coalhouse roof and was led to a special tap in the kitchen; my mother heated it and used it for washing hair. Anthony Appleyard (talk) 09:45, 6 October 2010 (UTC)
thread_title:  Avoiding hard water 

message: The overlap between these two articles is rather large, and it would seem to make a lot of sense to address it all in one article.Forbes72 (talk) 23:54, 15 December 2011 (UTC)
replies: text: Agree.  As a contributor to hard water, I have to agree that these articles should be merged.  Readers must be confused by having the two, although in some sense one is about technology to soften the water and one is about the problematic hard water itself.--Smokefoot (talk) 02:08, 16 December 2011 (UTC)

text: Oppose. The Water softening article has potential to grow, describing the various techniques in much more detail. However, I'd propose that hard water is renamed to water hardness so that both the properties of low-hardness and high-hardness water can be described. Merge the section on soap from water softening into water hardness, after which there is very little overlap between the two articles. Han-Kwang (t) 01:30, 30 December 2011 (UTC)

text: Oppose. There are other documented and substantiated ways to address hardness in water than softeners, such as Ion Exchange, Scale Inhibitors, and Physical Water Treatment like Template Assisted Crystallization. (See Peter Fox's ASU study, presented to the AZ Water Quality Association, November 19th, 2010, Tempe, AZ) To merge the articles creates a de facto endorsement of traditional softeners which is increasingly problematic as some municipalities begin to legislate against brine softening. Here is an article that lays this out: http://www.wcponline.com/pdf/1101Michaud.pdf .Darcyjae (talk) 16:52, 6 January 2012 (UTC)
replies: text: I don't understand your points. (1) Ion exchange is already discussed in the water softener article and (2) why would a merge be an endorsement? Han-Kwang (t) 23:08, 6 January 2012 (UTC)
replies: text: Did you look at the study? Those are all ways hard water can be mitigated without "water softening". Merging "water softening" into the "hard water" page, where water softening is discussed as one way to address hard water, makes sense. But putting the "hard water" info under "water softening" suggests that water softeners are the defacto answer to hard water, when they are only one of many solutions. I consider that an endorsement of water softeners over PWT and other methods of mitigating hard water damage. Darcyjae (talk) 17:20, 8 February 2012 (UTC)

text: Oppose.  Water hardness and softening are separate issues and they differ in scope. It is appropriate to have a separate description of what hardness is, what causes it, how it is analysed, and what its effects are. Softening, however complex and interesting it may be, is just an item in the hierarchy of issues related to water use. I realise this may be an argument for including it here, but because it happens to be a large item with many ramifications of its own, keeping it separate is rather good than bad. I don't see how it can be confusing if the articles are linked.  (Selkovjr (talk) 21:34, 7 January 2012 (UTC)

text: Oppose. but... there should be some references from this article to the other and mention of hardness removal in the article.   — Preceding unsigned comment added by 99.251.114.120 (talk) 14:37, 28 April 2012 (UTC)

text: Support. As indicated at {[Talk:Hard water]], I am in favor the proposed merger.--Smokefoot (talk) 04:22, 16 December 2011 (UTC)
thread_title:  Merge with Water softening 

message: Something is adrift with the conversions in the Measurement section here. If:
* 100.1 mg/l ≡ 1 mmol/l ≡ 5.608 dGH ≡ 5.847 gpg
which is what the first table gives, then, by simple multiplication,
 
* 0–60 mg/l ≡ 0–0.60 mmol/l ≡ 0–3.37 dGH ≡ 0–3.51 gpg
which is not what the second table gives. Instead it has:
* 0–60 mg/l ≡  0–0.60 mmol/l ≡ 0–10.7 dGH ≡ 0–3.50 gpg
They can't both be right. The fifth column of that table seems pointless. If mg/l and ppm are the same, why have a column for each, and with different ranges to boot? Justlettersandnumbers (talk) 19:39, 17 November 2014 (UTC)
thread_title: Wrong conversions

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thread_title:  External links modified 

message: There appears to be nothing about the importance of hardness for the aquarium industry? The standard there is German hardness. Even in the US. See e.g. Aquarium water quality (Florida Department of Agriculture and Consumer Services offices)fdacs Jcwf (talk) 16:41, 3 July 2020 (UTC)
thread_title:  Aquariums 

message: Soft water is a small, near-stub article, half of which is talking about hardness anyway. Rather than the daunting task of trying to expand Soft water, a merger under the general topic  (currently a redirect) makes sense. Pariah24 (talk) 10:49, 31 December 2020 (UTC)
replies: text: I would not object to the proposal provided the merge is done without loss of any sourced content and both residual redirects are retained.  Velella  Velella Talk   14:39, 31 December 2020 (UTC)

text: Support - main subject is hardness in water and its effects.  noq (talk) 15:32, 31 December 2020 (UTC)

text: Support - Soft water article would be difficult to expand. 1Wexford2 (talk) 16:14, 15 January 2021 (UTC)

text: Support - Makes utter sense, as de:Wasserhärte and sv:Vattenhårdhet has found. Ponken (talk) 10:22, 24 January 2021 (UTC)

text: Support - There is in reality no such thing as soft water, only degrees of hardness ;-) Should certainly be retitled also as proposed to  Mike Turnbull (talk) 11:25, 5 March 2021 (UTC)
replies: text:  Yes, fine, you gave plenty of time, . I've added the  to Soft water as per instructions at WP:MERGE. I assume you'll remove the tags on this article's page and formally close the merger so the bots remove it from the list. Mike Turnbull (talk) 13:26, 5 March 2021 (UTC)
thread_title:  Merge [[:soft water]] here 

message: "The various alternative units represent an equivalent mass of calcium oxide (CaO) or calcium carbonate (CaCO3) that, when dissolved in a unit volume of pure water, would result in the same total molar concentration of Mg2+ and Ca2+"
How does the dissolving of calcium carbonate in water result in Mg+2?  MimJan (talk) 12:24, 22 February 2023 (UTC)
replies: text: It's the same sum Ca+Mg, so when using only Ca-compounds, Mg is of course 0, while more Ca "compensates". So now only Ca → same total molar concentration as the "original" Ca+Mg. (Feel free to reword.) Ponken (talk) 20:45, 22 February 2023 (UTC)
thread_title:  Dissolving of calcium carbonate 

message: There's much about softening hard water, but nothing about hardening water that is so soft that it's like suds to the touch. 89.64.68.237 (talk) 23:45, 15 December 2023 (UTC)
thread_title:  "Slippery" water