Marine pH Test
User manual
Understanding and adjusting the pH value
The pH-value is a measure for the acidity of the water. The ideal pH for a marine tank is between 8.0 and 8.4. In case of a low pH, add Colombo Marine KH+ in order to increase it. A higher pH is rarely encountered; however should this be the case, you can lower the pH by making a water change; always check the pH of the fresh seawater first!
General Guidelines
- Always take care that the test tube is clean before use.
- Clean the tube directly after use.
- Take the volume of the water sample as precisely as possible.
- Keep the drop bottle perfectly vertical during dropping.
- Take care that no air bubbles are included in the drops.
Test procedure:
- Take a water sample of 5 ml.
- Add 5 drops of pH-test fluid
- Shake the test tube.
- Determine the pH-value using the included colour chart.
Test procedure:
- Take a water sample of 5 ml.
- Add 5 drops of pH-test fluid
- Shake the test tube.
- Determine the pH-value using the included colour chart.
For judging the colour of the water sample after adding all the test fluids, proceed as follows: put the test tube on the included colour chart and look through the tube on to the chart from directly above it. Do not look in direct sun light, but at indirect light. Compare the colour of the water sample with the colours on the chart. The closest colour shows the corresponding value. Generally the colours of the sample and on the chart will not be exactly the same, as values in practice will always be between the standard values, and thus a mixture of both consecutive values. Therefore, one should estimate between which colours the sample really lies.
For judging the colour of the water sample after adding all the test fluids, proceed as follows: put the test tube on the included colour chart and look through the tube on to the chart from directly above it. Do not look in direct sun light, but at indirect light. Compare the colour of the water sample with the colours on the chart. The closest colour shows the corresponding value. Generally the colours of the sample and on the chart will not be exactly the same, as values in practice will always be between the standard values, and thus a mixture of both consecutive values. Therefore, one should estimate between which colours the sample really lies.