15
pH (acidity)
Test procedure:
1. Take a water sample of 5 ml.
2. Add 5 drops of pH-test fl uid
3. Shake test tube.
4. Determine the pH-value using the included colour chart.
The pH-value is a measure for the acidity of the water. This can vary
from 0 to 14, with 7 being neutral, lower being acidic and higher being
basic. The most important thing about the pH is that it is within the
tolerant range of the fi sh that are kept, and that the pH is stable; for
this stability the carbonate hardness (KH) is important, see KH for more
information. Especially in older aquaria and ponds the pH has a ten-
dency to decrease, especially when there are little or no water changes.
Hence, test the pH regularly and refresh 10% of the water weekly.
The ideal pH for a normal fresh water aquarium is between 6.5 and 7.5.
When the pH is too high, you can lower it with Colombo pH-. When the
pH is too low, you can raise it with Colombo KH+. In specialised aquaria
the pH range is different e.g. discus fi sh (pH between 6.0 and 7.0) or
Tanganyika cichlids (pH between 8.0 and 9.0).
The ideal pH of a pond is between 7.0 and 8.5. A higher pH is rarely
encountered in ponds; however should this be the case, you can lower
the pH by refreshing water; fi rst check the pH of the fresh water and
add Colombo Fish Protect to the fresh water. In case of a low pH, add
Colombo KH+ in order to increase it.
20ml
15ml
10ml
5ml
20ml
15ml
10ml
5ml
5 dr
ops
5 ml.
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pH
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