A check valve is to prevent water from flowing back into the CO2 device when the CO2 stops. A bubble counter counts bubbles so that you have a way of measuring the injection rate.
The counter will only help in that you can tell how much you're injecting... but it does not in anyway controls the CO2 directly for you.








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] don't forget to keep your room well-ventilated..we sure don't want to lose an aquarist. Anyway, the CO2 is just too little to kill a human being i guess.

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