Understanding The Local Water Authority Values

[nry]

United Utilities provide my tapwater and they allow you to search via postcode for your water parameters. I do not have a kH test kit at present and was hoping to get a better value from this rather than use my horrible (and normally un-used!) Tetra test strips - thing is they do not list kH specifically, instead I am told:

Hardness level moderately hard
Hardness Clarkes 7.350 ° Clarke
Hardness 42 mg Ca/l

Does one of these actually give my potential kH value or can I use one of these to work out what my potential kH value is for my tap water? Can't find anything useful on Google so far tonight.

 

[PortWash]

I was able to come up with this:

Clark - English degrees of hardness are actually rarely used in the UK. One degree Clark is equal to 14.3 mg/I CaCO3.

Some argue that, because Clark is the form of hardness we're supposed to use in the UK, that this means that when we say GH, we're actually talking about 14.3 mg/l CaCO3 rather than the 17.9 mg/l CaCO3 you'd see if we were using dH. A fair point, but I've yet to meet anyone, inside or outside fishkeeping who actually uses Clark. Everyone considers GH in England to be 17.9 mg/l CaCO3 so it's essentially the same as DH in practice.

http/www.practicalfishkeeping.co.uk/pfk/...p?article_id=22

 

[nry]

I found that but still had no clue if I could get kH from the values listed?

 

[BHornsey]

Hi,

I'm certain most Local Authority report concern themselves with total hardness, GH.
If you look at my area report, on page 4, it shows Calcium, Magnesium and total hardness;
Doncaster Rural Water Quality
I'm not sure if you calculate it from calcium values?

 

[mikster]

On website i looked at it said to convert clarks to GH then multiply the value by 14.3 then you will get your GH in ppm i think.

 

[DevUK]

Found a few links, which I'm not sure if they will help but take a look:

Wikipedia article: http/en.wikipedia.org/wiki/Hard_water#Types_of_measurement

Hagen's hardness converter: http/www.hagen.com/usa/aquatic/gh_kh_conv_cal.cfm

I had trouble with the converter but you might be able to figure it out