pH is the measurement of acidity and alkalinity of water. The reading of pH7 is neutral, a reading higher than 7 is alkaline and lower is acidic.

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2. pH is the measurement of acidity and alkalinity of water. The reading of pH7 is
neutral, a reading higher than 7 is alkaline and lower is acidic.
pH measurement is widely used in all industries where water quality control is
needed. Depending on the accuracy and resolution, temperature compensation is
employed to ensure accuracy of the pH glass sensor. Display resolution of 0.1pH
generally do not require temperature compensation as the error is negligible.
ORP / Redox
Oxidation Reduction Potential (ORP) or Redox in short is the measurement of ion
activity in a solution.
When an atom gain or loose an oxygen electron, a minute voltage is register. Redox is
measured in the unit of mili-volts (mV), where positive reading represents the solution
that is active and has strong oxidising power.
In aquaria, positive reading represent the presence of Aerobic bacteria which is
responsible to reduce toxidity in water, while negative reading represent more
anaerobic bacteria which may increase toxidity in water.
Yet Redox is volatile. Therefore, Redox should be measured as a trend by charting
results over a period to time. Solution with strong oxidising power makes Redox
sensing easy, and results are stabilized within minutes. Solutions with low activity
usually takes a longer time. Sometime, the results to stability can be as long as
20minutes.

3. "The aquarium represents not only the most beautiful, but also the most educational and
multi-faceted activity," said Kaspar Horst, author of "My First Aquarium".
Owning an aquarium is not just about feeding your fishes well and changing the water
frequently, you should also consider many other aspects such as the temperature,
acidity, conductivity, light, oxygen, hardness of the water, etc.
You should also monitor the water quality regularly so that the fishes will not be
subjected to stress and fish-diseases can be prevented. In this page, we will be
exploring the conditions of managing an aquarium.
First of all, the quality of the water in an aquarium is as important to fishes, as the air
you breathe is to you. Even more so, because these life forms have to rely on you, the
owner of the aquarium.
Testing & Water Quality
The only way for you to know how good or bad the water quality really is, is by testing it on a regular
basis and keeping notes of the results in a diary.
Testing and keeping records is important in a basic reef aquarium. Moreover, keeping records will enable
you to monitor how your tank "behaves". Any deviation in water quality parameters will be detected, as
you are able to refer to previous readings.
The most important tests for your aquarium are pH, dissolved oxygen, ammonia and nitrite. Other tests
that can be monitored are conductivity, temperature, hardness, nitrate, phosphate, residual ozone (if you
are using an ozonizer), iron (if you keep macro-algae and fertilize), copper and total chlorine.
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#06-04/05 Petro Centre, Singapore 159349
sales@transinstruments.com
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