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#1
01-02-2009, 07:09 PM
 Neil F Guest Posts: n/a
Re: mg/L to mmol/L

I am trying to compare the water hardness posted by my council to the setting on my diswasher
the council states
Town water in Caboolture Shire usually contains between 100 and 200 mg/L total hardness

the diswasher operating instrustions say it is set (by default) to 0.2 - 0.7 mmol/l
#2
01-03-2009, 04:28 AM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,443 Rep Power: 19
Re: mg/L to mmol/L

Quote:
 Originally Posted by Neil F I am trying to compare the water hardness posted by my council to the setting on my diswasher the council states Town water in Caboolture Shire usually contains between 100 and 200 mg/L total hardness the diswasher operating instrustions say it is set (by default) to 0.2 - 0.7 mmol/l
The range 100 - 200 mg/L would be equivalent to 1 - 2 mmol/L.

Water hardness given in mg/L is total equivalent calcium carbonate/ Calcium carbonate has a molar mass of 100.087 g/mol. (I rounded off to 100 in the above as the range doesn't seem very precise). Actual hardness may be a mixture of Ca++ and Mg++ ions and measuring those in moles is probably more "scientific."
#3
01-20-2012, 09:27 PM
 Unregistered Guest Posts: n/a
Re: mg/L to mmol/L

thanks for the conversion units. I also have a dishwasher , a Miele that wants to know Rose bay Sydney levels, Your reply has saved me doing maths. My machine is calibrated to 0.2 mmol while the hardness here is 0.5 to 0.7 so i have more to do
a great help. thanks you
mary
#4
02-29-2012, 04:58 PM
 Unregistered Guest Posts: n/a
Re: mg/L to mmol/L

Great info.

I also have a Miele and was told the hardness in Springwood is soft below 0.7 mmol/l.

The factory setting for hardness is 0.2 - 0.7 so you do not need to change any settings or add salt if the water is constantly lower than 0.7. I have done neither and sometimes I get rust spots on dishwasher safe utensils and sometimes a cloudy residue. I use a Rinse Aid.

I got a website off Allconnex Water seqwgm.qld.gov.au that does monthly reporting of the Sth East Qld Bulk Water quality. The standard is below 2 mmol/L or 200 mg/L.

Interestingly, Zone 2 Logan area hardness for Jan 2012 is 1.06 mmol/L.
Zone 3 Redlands is 0.6 mmol/L. Not sure where the bulfk water for our street comes from but I have a feeling it varies as the washing results testify.

I'm going to add Salt and change the Dishwasher hardness setting to 0.9 - 1.3 mmol/L and see how I go.

Will keep you posted.
#5
01-31-2014, 03:15 PM
 Unregistered Guest Posts: n/a
Re: mg/L to mmol/L

Hi, I also have a Miele dishwasher.

Water in Papakura, New Zealand comes from Ardmore, Hunua falls and is moderately soft, Veola Water told me, 30mg/l.

If my calculations are correct, this means I won't need dishwasher salt and the mg/l converts to about less than 0.5mmol/l.

Hope this helps someone in this area.

Helen
#6
03-04-2014, 08:51 AM
 mellac22@comcast.net Guest Posts: n/a
Re: mg/L to mmol/L

mmol/l into mg/l
#7
03-05-2014, 03:58 AM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,443 Rep Power: 19
Re: mg/L to mmol/L

Quote:
 Originally Posted by mellac22@comcast.net mmol/l into mg/l
Divide by the molar mass (which is substance-specific) in grams per mole.

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