|
What is dH?
dH is a measure of the degree of General Hardness of water based on the
amount of dissolved calcium carbonate present. General hardness can also
be measured in ppm (parts per million).
|
Hardness (GH) |
dH |
ppm |
|
Very soft |
0 - 4 |
0 - 70 |
|
Soft |
4 - 8 |
70 - 140 |
|
Medium Hard |
8 - 12 |
140 – 200 |
|
Hard |
12 - 20 |
200 – 350 |
|
Very Hard |
20 or more |
350 or more |
Most fish can survive in a wide range of water hardness, however dH can be
particularly important in creating proper breeding conditions. Water can
be softened by filtering it through peat moss, boiling it or by passing it
through a reverse osmosis filter. Water can be hardened by subjecting it
to crushed coral or dolomite. Soft water needs more monitoring as the pH
level becomes very unstable in soft water.
kH is another measure of water hardness. It measures minerals other
than calcium and magnesium and is not frequently used.
|
