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Introduction
1.2 Conversions
1.2.1 Chemical Species
1.2.2 Hardness
Units of
mg/L
Measure
CaCO
3
mg/L
1.0
CaCO
3
English
gr/gal
14.3
CaCO
3
US gr/gal
17.1
CaCO
3
Fr. p/
100,000
10.0
CaCO
3
Ger.
p/100,000
17.9
CaO
meq/L
50.0
g/L CaO
1790.0
lbs./cu ft
16,100.0
CaCO
3
1
epm/L, or mval/L
meq
•
Note:
--------- -
=
N 1000
L
Introduction
Page 14
Table 2 lists the factors for converting hardness from one unit of measure to
another. For example, to convert mg/L CaCO
multiply the value in mg/L x 0.056
Table 2 Hardness Conversion Factors
British
American
gr/gal
gr/gal (US)
(Imperial)
CaCO
3
CaCO
3
0.07
0.058
1.0
0.83
1.2
1.0
0.7
0.58
1.25
1.04
3.5
2.9
125.0
104.2
1,123.0
935.0
3
.
French
German
Parts/
Parts/
100,000 CaCO
100,000 CaO
3
0.1
0.056
1.43
0.83
1.72
0.96
1.0
0.56
1.79
1.0
5.0
2.8
179.0
100.0
1,610.0
900.0
to German parts/100,000 CaO,
1
meq/L
g/L CaO
-4
0.02
5.6x10
-3
0.286
8.0x10
-3
0.343
9.66x10
-3
0.2
5.6x10
-2
0.358
1x10
-2
1.0
2.8x10
35.8
1.0
321.0
9.0
5940022Intro.fm
lbs./cu ft
CaCO
3
-5
6.23x10
-4
8.9x10
-3
1.07x10
-4
6.23x10
-3
1.12x10
-2
3.11x10
0.112
1.0
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