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Simple / Inexpensive Bubble Counter
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I built this for about $3. A small bottle from any store, drilled two holes (3/16") inserted two 'Air Line Tubing Connectors', attach small piece of CO2 safe air-line to one, and put a little aquarium safe sealer on the connectors, so no air leaks out.
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Bigwave is showing one he has made that is much less expensive than what you buy in stores, and just as effective. It is used to determine how much CO2 is actually getting into the tank, so you can control/regulate the dosage.
