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Q. I cannot fine-adjust the CO2 supply rate with CO2 Regulator (fine-adjustment screw).

A. If the CO2 tube is too long, it is hard to fine adjust the CO2 supply rate with the fine adjustment screw on CO2 Regulator. The length of silicon or pressure resistance tube should be minimal. If there is no choice but a long tube is required for large aquarium tank, you may additionally install Speed Controller near the CO2 Bubble Counter (or CO2 Beetle Counter) for easy fine adjustment. This problem is also observed if CO2 is leaking due to damaged check valve. Replace the plastic check valve with a new one about once a year. Check valve is contained in Clear Parts Set (or Gray Parts Set).

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