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  #74  
Old August 24th 12, 11:18 AM posted to uk.tech.digital-tv
Roderick Stewart[_2_]
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In article , Davey wrote:
My area in East Anglia: "Your water is Very Hard at 172 mg/l as
calcium."
Epping, which is nearer to London, has only 140 mg/l Ca/l or 350
mg/l CaCo3. Described as 'hard'.
But then, the Victoria/Parliament area of London is reported as 270
CaCo3, but only 'Hard.' Now that's confusing.


Maybe the denizens of the Victoria/Parliament area of London have
thicker skins?

Rod.
--

  #75  
Old August 24th 12, 11:40 AM posted to uk.tech.digital-tv
Andy Burns[_7_]
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Davey wrote:

My area in East Anglia: "Your water is Very Hard at 172 mg/l as
calcium."


i.e. 430 mg/l CaCO3

Epping, which is nearer to London, has only 140 mg/l Ca/l or 350
mg/l CaCo3. Described as 'hard'.
But then, the Victoria/Parliament area of London is reported as 270
CaCo3, but only 'Hard.'

Now that's confusing.


Not really, it seems the threshold between "hard" and "very hard" lies
somewhere between 350 and 430 mg/ml CaCO3



  #76  
Old August 24th 12, 11:43 AM posted to uk.tech.digital-tv
Davey
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On Fri, 24 Aug 2012 10:18:04 +0100
Roderick Stewart wrote:

In article , Davey wrote:
My area in East Anglia: "Your water is Very Hard at 172 mg/l as
calcium."
Epping, which is nearer to London, has only 140 mg/l Ca/l or 350
mg/l CaCo3. Described as 'hard'.
But then, the Victoria/Parliament area of London is reported as 270
CaCo3, but only 'Hard.' Now that's confusing.


Maybe the denizens of the Victoria/Parliament area of London have
thicker skins?

Rod.
--


It's where my bank is....
--
Davey.
  #77  
Old August 24th 12, 11:56 AM posted to uk.tech.digital-tv
Davey
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On Fri, 24 Aug 2012 10:40:54 +0100
Andy Burns wrote:

Davey wrote:

My area in East Anglia: "Your water is Very Hard at 172 mg/l as
calcium."


i.e. 430 mg/l CaCO3

Epping, which is nearer to London, has only 140 mg/l Ca/l or 350
mg/l CaCo3. Described as 'hard'.
But then, the Victoria/Parliament area of London is reported as 270
CaCo3, but only 'Hard.'

Now that's confusing.


Not really, it seems the threshold between "hard" and "very hard"
lies somewhere between 350 and 430 mg/ml CaCO3




Yes, re-reading it in the cold light of day, it makes more sense. It
was the use of both Ca and CaCO3 that confused me, I think. That, and
the hour of day at which I was looking at it.
But it does at least confirm that here in East Anglia, we have "Very
Hard" water. Hence the prevalence of water softeners.
--
Davey.
  #78  
Old August 24th 12, 12:20 PM posted to uk.tech.digital-tv
Dave Plowman (News)
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In article ,
Bill Findlay wrote:
Until I was 9 I lived in a 4th floor tenement flat that shared a
cold-water toulet on the half-landing with the flat next door. In
winter the water in the cistern would freeze; in summer the cistern was
used as a nesting perch by the doos. I well remember the tin bath in
front of the kitchen fire.


That's the type I remember from Aberdeen.

--
*A nest isn't empty until all their stuff is out of the attic

Dave Plowman London SW
To e-mail, change noise into sound.
  #79  
Old August 24th 12, 01:04 PM posted to uk.tech.digital-tv
Zimmy[_2_]
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On 21/08/2012 21:34, Martin wrote:
On Tue, 21 Aug 2012 00:02:41 +0100, "Dave Plowman (News)"
wrote:

In article ,
Andy Champ wrote:
On 20/08/2012 18:37, Dave Plowman (News) wrote:
Most run a fresh water tap before drinking from it - or even filling
the kettle.


He'd have to run it a long time to drop the lead level in the lead-lined
tank...


Indeed. I'm amazed such things still existed in a tenement - they're not
exactly a tower block.


They are common in Victorian buildings. They are zinc coated not lead
coated.


That doesn't sound like this one, it was more like a big shallow wooden
crate with soft lead pushed into it and nailed on around the top. There
was no 'coating' AFAICS.

Z
  #80  
Old August 24th 12, 02:58 PM posted to uk.tech.digital-tv
Andy Burns[_7_]
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Posts: 1,268
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Davey wrote:

Andy Burns wrote:

it seems the threshold between "hard" and "very hard"
lies somewhere between 350 and 430 mg/ml CaCO3

Yes, re-reading it in the cold light of day, it makes more sense. It
was the use of both Ca and CaCO3 that confused me, I think.


The molecular weight of a compound such as CaCO3 is the sum of the
atomic weights

Ca + C + O3
= 40 + 12 + (16 x 3)
= 100

so the weight of calcium = 40/100ths of the weight of calcium carbonate

But it does at least confirm that here in East Anglia, we have "Very
Hard" water.


Yes

Hence the prevalence of water softeners.


 




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