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The best bet is to make a rough guess, and then set the system up in the manner in which it will be operated. Be prepared to take a number of tests with the glass tube/ syringe CO2 tester. Take the test after the first vinegar dump, and then adjust the burette or IV bottle by increasing or decreasing the rate at which it fills to a point where it will contain more or less vinegar when the next exhaust! vinegar dump cycle occurs. The variables in this piece of equipment (dump cycle and fill rate) are easily controlled. The settings that produce 1500 ppm one time should do the job pretty much the same way every time. There has been mention in popular literature of different animals being allowed to enter the growing chamber, to provide CO2 via the air they exhale. In the most common situation, an indoor growing room for white widow or chamber in a house or apartment, the only animal that should be allowed in is the human animal.

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