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JBL water test kit PH NO2 NO3 Ca Mg Cu O2 CO2 PO4 NH4 GH KH Fe aquarium fresh maring water fish tank|test no3|nh4 testingno2 test - AliExpress
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JBL water test kit PH NO2 NO3 Ca Mg Cu O2 CO2 PO4 NH4 GH KH Fe aquarium fresh maring water fish tank|Water Quality Testing| - AliExpress
![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 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](https://preview.redd.it/jcl1ljk11es61.jpg?auto=webp&s=a1d5d0955924f9c60e7907d44c901c308c03aacb)