Why is my co2 drop checker constantly blue? I am using the JBL Permanent Co2 plus pH Aquatest. The instructions indicate that you add 35 drops of the provided tester liquid into
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![JBL ProAquaTest CO2-pH Permanent [kaufen & informieren] auf Whitecorals.com](https://www.whitecorals.com/media/images/org/1JBL_ProAquaTest_CO2_pH_Permanent.jpg "JBL ProAquaTest CO2-pH Permanent [kaufen & informieren] auf Whitecorals.com")
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