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Conversion table for water hardness units of measure



According to definition, water hardness is a value characteristic of the dissolved salts found in water (calcium and magnesium hydrogen-carbonate, dH = 0.357 meq/l).

Unit
mekv/l
dH (dH)
e
f (tH)
mg/l CaCO3
gpg CaCO3
1 mekv/l
1
2.805
3.51
5
50
2.924
1 dH (dH)
0.3536
1
1.25
1.78
17.8
1.042
1 e
0.2852
0.8
1
1.43
14.3
0.833
1 f (tH)
0.2
0.561
0.702
1
10
0.585
1 mg/l CaCO3
0.02
0.0561
0.0702
0.1
1
0.0585
1 gpg CaCO3
0.342
0.9593
1.2004
1.71
17.1
1


  • 1 dH (dH) German hardness: Ca and/or Mg salt, which is equivalent to 1 dH=17.85 mg/l calcium carbonate (CaCO3) or 1 dH=10 mg/l calcium oxide (CaO), is dissolved in 1 litre of water.
  • 1 meq/l of hardness means that 1 litre of water contains 1 meq, that is 1 mg equivalent weight of dissolved hardness minerals (Ca and/or Mg).
  • 1 e that is 1 English degree of hardness means that 0.8 litres of water contains dissolved hardness minerals (Ca and/or Mg) equivalent to 10 mg CaO. (another definition: 1 English degrees of hardness (Clark) means that 1 gallon (i.e. imperial U.K. gallon, 4.546 litres) of water contains dissolved hardness minerals (Ca and/or Mg) equivalent to 1 grain (i.e. 0.0648 gramm) CaCO3.
  • 1 f (tH) that is 1 French degree of hardness means that 1 litre of water contains dissolved hardness minerals (Ca and/or Mg) equivalent to 10 mg CaCO3.
  • 1 ppm CaCO3 hardness means that 1 litre of water contains dissolved hardness minerals (Ca and/ or Mg) equivalent to 1 mg CaCO3.
  • 1 gpg CaCO3 that is 1 grain/gallon of hardness means that 1 gallon (i.e. U.S. gallon, 3.785 litres) of water contains dissolved hardness minerals (Ca and/or Mg) equivalent to 1 grain (i.e. 0.0648 gram) CaCO3.






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