Long-term test CO2 Correct + pH Precise and permanent control of the CO2 content in the aquarium Ease: you don't have to take any additional carbonate hardness measurements - you just need a single color scale Reliability: The Correct long-lasting CO2 test always shows the exact CO2 level, independent of other acids in the aquarium water Accuracy: With the Correct long-term CO2 test, you can directly determine the CO2 content in milligrams per litre: even with low carbonate hardness!
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