How is the CO2 content of the digital water test strip determined?
Unlike the other six parameters on the quick test strip of the JBL PROSCAN digital water test, the CO2 content is calculated on the basis of the pH and carbonate hardness values measured in your aquarium water. This is reported in three categories: "Value too low", "Everything OK" and "Value too high". You may recognise this procedure from the so-called CO2 tables which you can also find in the JBL Themeworld Aquarium:
https://www.jbl.de/?mod=areas&func=essential_section&lang=en&id=74&country=gb
The procedure is only an indicator, however, as other acidic substances can falsify the calculation. If you want to know the exact content, a drop test will help. You can carry out this fast and very accurate method of determining the CO2 content with the JBL PROAQUATEST CO2 Direct. Just add an indicator liquid to a sample of your aquarium water and count the drops until a stable pink coloration is obtained. This test even enables you to eliminate other acid influences on the test result.
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