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    What is the most efficient and cheap way to provide CO2 to my plants?

    Put about five or six cups of sugar in a clean one-gallon plastic jug. To this add about a half gallon of water. Mix until the sugar is dissolved and add a little bit of active yeast. Poke a small hole in the lid and replace it on top of the jug. Once a day, or as often as possible, shake the...
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