Water - The Environment
General Hardness (GH): Tables and Information
Written by Friday, 28 September 2001 00:00
The table below shows the GH values of a tank (or water change) volume - expressed in Liters. The values in the light blue shaded area express the grams of Calcium Carbonate needed to achieve the corresponding GH value for that specific volume. You should look at the GH column and find the GH value you have measured for your tank. For instance, suppose you have found a GH value of 11 degrees. You must go to GH=11 and find the column corresponding to the water volume you have. For 60 Liters the figure found is 11,2. So actually you have a total quantity of 11,2 grams of Calcium Carbonate (or equivalent) in your tank water.
|
GH/Lts |
10 |
20 |
30 |
40 |
50 |
60 |
70 |
80 |
90 |
100 |
|---|---|---|---|---|---|---|---|---|---|---|
|
1 |
0,17 |
0,34 |
0,51 |
0,68 |
0,85 |
1,02 |
1,19 |
1,36 |
1,53 |
1,7 |
|
2 |
0,34 |
0,68 |
1,02 |
1,36 |
1,7 |
2,04 |
2,38 |
2,72 |
3,06 |
3,4 |
|
3 |
0,51 |
1,02 |
1,53 |
2,04 |
2,55 |
3,06 |
3,57 |
4,08 |
4,59 |
5,1 |
|
4 |
0,68 |
1,36 |
2,04 |
2,72 |
3,4 |
4,08 |
4,76 |
5,44 |
6,12 |
6,8 |
|
5 |
0,85 |
1,7 |
2,55 |
3,4 |
4,25 |
5,1 |
5,95 |
6,8 |
7,65 |
8,5 |
|
6 |
1,02 |
2,04 |
3,06 |
4,08 |
5,1 |
6,12 |
7,14 |
8,16 |
9,18 |
10,2 |
|
7 |
1,19 |
2,38 |
3,57 |
4,76 |
5,95 |
7,14 |
8,33 |
9,52 |
10,71 |
11,9 |
|
8 |
1,36 |
2,72 |
4,08 |
5,44 |
6,8 |
8,16 |
9,52 |
10,88 |
12,24 |
13,6 |
|
9 |
1,53 |
3,06 |
4,59 |
6,12 |
7,65 |
9,18 |
10,7 |
12,24 |
13,77 |
15,3 |
|
10 |
1,7 |
3,4 |
5,1 |
6,8 |
8,5 |
10,2 |
11,9 |
13,6 |
15,3 |
17 |
|
11 |
1,87 |
3,74 |
5,61 |
7,48 |
9,35 |
11,2 |
13,1 |
14,96 |
16,83 |
18,7 |
|
12 |
2,04 |
4,08 |
6,12 |
8,16 |
10,2 |
12,2 |
14,3 |
16,32 |
18,36 |
20,4 |
|
13 |
2,21 |
4,42 |
6,63 |
8,84 |
11,1 |
13,3 |
15,5 |
17,68 |
19,89 |
22,1 |
|
14 |
2,38 |
4,76 |
7,14 |
9,52 |
11,9 |
14,3 |
16,7 |
19,04 |
21,42 |
23,8 |
|
15 |
2,55 |
5,1 |
7,65 |
10,2 |
12,8 |
15,3 |
17,9 |
20,4 |
22,95 |
25,5 |
|
16 |
2,72 |
5,44 |
8,16 |
10,9 |
13,6 |
16,3 |
19 |
21,76 |
24,48 |
27,2 |
|
17 |
2,89 |
5,78 |
8,67 |
11,6 |
14,5 |
17,3 |
20,2 |
23,12 |
26,01 |
28,9 |
|
18 |
3,06 |
6,12 |
9,18 |
12,2 |
15,3 |
18,4 |
21,4 |
24,48 |
27,54 |
30,6 |
|
19 |
3,23 |
6,46 |
9,69 |
12,9 |
16,2 |
19,4 |
22,6 |
25,84 |
29,07 |
32,3 |
|
20 |
3,4 |
6,8 |
10,2 |
13,6 |
17 |
20,4 |
23,8 |
27,2 |
30,6 |
34 |
The following table shows the GH values of a tank (or water change) volume - expressed in US gallons. The values in the light blue shaded area indicate the grams of Calcium Carbonate needed to achieve the corresponding GH value for that specific volume. You have to know the GH value (run a GH test) and the total water volume in order to use this table. Then you should look at the GH column. Suppose, for instance, that you have found a GH value of 11 degrees. You must go to GH=11 and find the column corresponding to the water volume you have. For 60 gallons the figure found is 42,41. So you have a total quantity of 42,41 grams of Calcium Carbonate.
Since Calcium Carbonate is very slightly soluble in water (it is characterized as practically insoluble) Calcium Sulfate is used instead. The ratio of masses is 1.17 (you have to add 1,17 times more grams of the sulfate compound to get the same GH). I usually mix calcium sulfate with magnesium sulfate and sodium bicarbonate. This brings calcium, magnesium and carbonates to the desired concentrations. If you happen to be keeping Africans they will also need the sodium and sulfates present in this mixture.
|
GH/Lts |
10 |
20 |
30 |
40 |
50 |
60 |
70 |
80 |
90 |
100 |
|---|---|---|---|---|---|---|---|---|---|---|
|
1 |
0,64 |
1,29 |
1,93 |
2,57 |
3,21 |
3,86 |
4,50 |
5,14 |
5,78 |
6,43 |
|
2 |
1,29 |
2,57 |
3,86 |
5,14 |
6,43 |
7,71 |
9,00 |
10,28 |
11,57 |
12,85 |
|
3 |
1,93 |
3,86 |
5,78 |
7,71 |
9,64 |
11,57 |
13,49 |
15,42 |
17,35 |
19,28 |
|
4 |
2,57 |
5,14 |
7,71 |
10,28 |
12,85 |
15,42 |
17,99 |
20,56 |
23,13 |
25,70 |
|
5 |
3,21 |
6,43 |
9,64 |
12,85 |
16,07 |
19,28 |
22,49 |
25,70 |
28,92 |
32,13 |
|
6 |
3,86 |
7,71 |
11,57 |
15,42 |
19,28 |
23,13 |
26,99 |
30,84 |
34,70 |
38,56 |
|
7 |
4,50 |
9,00 |
13,49 |
17,99 |
22,49 |
26,99 |
31,49 |
35,99 |
40,48 |
44,98 |
|
8 |
5,14 |
10,28 |
15,42 |
20,56 |
25,70 |
30,84 |
35,99 |
41,13 |
46,27 |
51,41 |
|
9 |
5,78 |
11,57 |
17,35 |
23,13 |
28,92 |
34,70 |
40,48 |
46,27 |
52,05 |
57,83 |
|
10 |
6,43 |
12,85 |
19,28 |
25,70 |
32,13 |
38,56 |
44,98 |
51,41 |
57,83 |
64,26 |
|
11 |
7,07 |
14,14 |
21,21 |
28,27 |
35,34 |
42,41 |
49,48 |
56,55 |
63,62 |
70,69 |
|
12 |
7,71 |
15,42 |
23,13 |
30,84 |
38,56 |
46,27 |
53,98 |
61,69 |
69,40 |
77,11 |
|
13 |
8,35 |
16,71 |
25,06 |
33,42 |
41,77 |
50,12 |
58,48 |
66,83 |
75,18 |
83,54 |
|
14 |
9,00 |
17,99 |
26,99 |
35,99 |
44,98 |
53,98 |
62,97 |
71,97 |
80,97 |
89,96 |
|
15 |
9,64 |
19,28 |
28,92 |
38,56 |
48,20 |
57,83 |
67,47 |
77,11 |
86,75 |
96,39 |
|
16 |
10,28 |
20,56 |
30,84 |
41,13 |
51,41 |
61,69 |
71,97 |
82,25 |
92,53 |
102,82 |
|
17 |
10,92 |
21,85 |
32,77 |
43,70 |
54,62 |
65,55 |
76,47 |
87,39 |
98,32 |
109,24 |
|
18 |
11,57 |
23,13 |
34,70 |
46,27 |
57,83 |
69,40 |
80,97 |
92,53 |
104,10 |
115,67 |
|
19 |
12,21 |
24,42 |
36,63 |
48,84 |
61,05 |
73,26 |
85,47 |
97,68 |
109,88 |
122,09 |
|
20 |
12,85 |
25,70 |
38,56 |
51,41 |
64,26 |
77,11 |
89,96 |
102,82 |
115,67 |
128,52 |
For more information on these chemicals see here.
For a more detailed discussion of equivalent quantities you can visit this page.
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